查询词典 three-four time

Within the divergent section of the nozzle extension, the combustion gas continues to expand with increasing velocity (10,000 to 15,000 ft/sec, two to three miles/sec, or three to four times the speed of a high-powered rifle bullet) until it is expelled at the desired nozzle area ratio and gas static pressure to maximize thrust chamber performance.

内部分歧的一段喷嘴延长，燃烧气体的不断扩大，日益增加的速度（ 10000一点五万英尺/秒， 2时58英里/秒，或3至4倍的速度一高功率步枪子弹），直到是驱逐在理想的喷嘴面积比例和天然气的静压力，以最大限度地推力室的表现。

Shading experiments were designed according to low light intensity problem caused by intercropping system of peanut with maize or wheat et al. Fenghua1 and Fenghua2 were adopted in the experiment of four light intensity levels (CK in which the plants were grown under natural light, 27% shading, 43% shading and 77% shading), which carried out at three growth stage using black sunshade net. And the three stages were seedling phase, pod-setting phase and pod-maturing phase. The aim of this study was to investigate the effects of low light on the photosynthetic characteristics, luminous energy distribute of PSⅡ, RuBPCase activitiy, plant morphogenesis, dry matter production, pod yield and quality of peanut at different stages, defined the relationship between dry matter accumulation and PAR, relationship of efficiency for solar energy utilization and PAR, and then set up the ...dry matter production and yield formation model on the basis of the experimental data.

针对花生与玉米、小麦等作物间作、套种造成遮光问题，选用大花生品种丰花1号和小花生品种丰花2号做为供试材料，在花生苗期、结荚期和饱果期分别用不同透光率的遮阳网进行遮光处理模拟弱光条件，设置自然光、遮光27%、遮光43%和遮光77%四种光强水平，研究了光强处理对花生光合特性、光系统Ⅱ光能分配、RuBPCase活性、植株形态建成、物质生产和产量以及品质的影响，明确了不同时期干物质积累及光能利用率与光合有效辐射的关系，以此为基础采用2种方法建立了花生干物质生产动态模型和花生产量形成模拟模型，并对各模型的模拟精度进行了比较。

Blast-off in China. This rocket carrying three men into space with one slated to make the country's first spacewalk. The mission will last three to four days.

中国载人火箭发射升空，火箭上载有三名宇航员，其中一个将进行太快行走，这将是中国的第一次太空行走。

With four days of consecutive heavy wind and rain, the roads in Kota Bharu of Kelantan are flooded. Every year end the northeast monsoon season affects the three east coast states, Kelantan, Terengganu, and Pahang. Ports in the three states are closed until further notice.

连续四天的刮风下雨，吉兰丹的哥打巴鲁市的大马路成了河流，每到年尾因为受到东北季风，带来大量雨水的影响，东海岸三个州，吉兰丹，登嘉楼，彭亨必定受到影响，三州的港口必定封港。

Results Malang Sag has two important times uplifting and three times subsiding, while Tiaohu Sag has three times uplifting and four times subsiding.

结果 马朗凹陷主要经历了2个隆起期和3个沉降期，条湖凹陷为3个隆起期和4个沉降期；早、中二叠世两凹陷的沉降幅度很大，沉积速率最大可达133.46m/Ma；晚白垩世的隆起幅度最大，地层剥蚀厚度可达846m。

During the postgenomics era the information about genomic sequence and gene functions provides a new foundation for evolutionary biology and ecology As the first whole-genome sequenced plant Arabidopsis thaliana and its wild relatives have played a critical role in understanding the evolution of genomics and speciation Both A halleri and A lyrata are closely related to the model species A thaliana A halleri ssp gemmifera occurs in northeastern China Japan and Taiwan; while its sister A halleri ssp halleri is mainly distributed in Europe Geographical barriers such as Tienshan Mountain Range isolate these intraspecific sisters Likewise A lyrata ssp kamchatica and ssp lyrata occur in East Asia and North America respectively Such distribution patterns seem to be consistent with allopartic speciation The comparison between ancestral and extant polymorphism by multilocus can be informative about the population genetics of speciation In this study we collected and analyzed DNA sequences of 98 genes from four wild relatives of A thaliana A halleri ssp gemmifera A halleri ssp halleri A lyrata ssp kamchatica and A lyrata ssp lyrata The ancestral states of these four species were compared to each other in terms of level of genetic variation However the ancestral species at the time of speciation were substantially more polymorphic than the extant geographical populations The observations are not fully compatible with speciation by strict allopatry At some species pairs parapatric speciation seems more reasonable in speciation of Arabidopsis The 98 gene sequences are also used for the congruence test between gene genealogy and species phylogeny Only 28 genes support the species phylogeny but there are 23 genes supports another major genealogy { lyrata} thaliana Based on the phylogenetic position change of A lyrata ssp kamchatica and Ks value for each species pair suggested the recent directional gene flow between A halleri ssp gemmifera and A lyrata ssp kamchatica

阿拉伯芥是第一个完成基因体定序的开花植物，其基因体资讯提供植物学研究的重要依据；在解析阿拉伯芥属物种的亲缘关系以及种化机制等重要的演化议题时，阿拉伯芥近缘的野生物种自然成了不可或缺的关键；跟阿拉伯芥近缘的物种包括A halleri及A lyrata，其中A halleri ssp gemmifera主要分布於中国东北、日本以及台湾，与近缘的A halleri ssp halleri其分布於欧洲隔著天山及大陆的障蔽，而A lyrata ssp kamchatica主要分布於东北亚及台湾，与分布於北美五大湖的A lyrata ssp lyrata被北极圈所分隔，这样的分布模式暗示异域种化的可能。藉由多基因分析比较祖先物种与现生物种遗传歧异度的相关可提供讯息探讨种化时期的族群遗传结构，本研究针对A halleri ssp gemmifera、A halleri ssp halleri及A lyrata ssp kamchatica、A lyrata ssp lyrata四个物种，两对互为亚种的姊妹群，以阿拉伯芥为外群进行研究，在四个物种完成98个同源基因的分子序列，利用套装软体MCMCcoal来估算祖先物种的遗传变异，亦估算现生物种的核苷酸歧异度，观察到？多物种配对中祖先物种遗传多型性大於现生物种DNA歧异度，显示异域种化模型并无法完全解释阿拉伯芥属物种的种化模式，在某些物种配对间邻域种化模式应比异域种化更为可能；在基因树与物种树的比较，98个基因片段的亲缘模式只有28个是与已知物种树一致的，有23个基因其树状图支持{ lyrata} thaliana的型式，藉由kamchatica位置的变化以及估算各物种配对间的平均同义置换率，推测在A halleri ssp gemmifera与A lyrata ssp kamchatica间具有近代的单方向基因交流。

In order to decolorize the polysaccharide from Cardamine enshiensis ,the hydrogen peroxide was used to be reagent for decolorizing the polysaccharide,and the time,temperature,pH as well as the concentration of hydrogen peroxide were selected to be factors for the experiment of single factor,then the orthogonal test with four factors and four levels was carried out on the aforementioned basis.

为了脱除碎米荠多糖液中的色素，以过氧化氢(H2O2)为脱色剂，选择脱色时间、脱色温度、pH值和过氧化氢的质量百分比浓度等因素为试验因素，进行单因素试验，以此为基础进行4因素4水平的正交试验。

The following are main points in the thesis.(1) On the basis of widely researching of the domestic and overseas references, there are four types of depolarizers being summed up and introduced in this thesis, the four types are spatial averaging depolarizer, time averaging depolarizer, fiber ring depolarizer and spectral averaging depolarizer.

本论文主要完成的工作是：(1)在查阅了大量的文献的基础上，总结了四种类型的退偏器，空间偏振态平均退偏器、时域平均退偏器、光纤环退偏器、光谱平均退偏器，并分别对四种类型的退偏器的工作原理进行了深入的研究，为每种退偏器的设计方法建立了数学模型。

The main research contents and results are given as follows:(1) Principles and characteristics of different types of polarization controllers are analyzed, the compare of the difference of these polarization controllers are discussed based on them, drawn a conclusion that the polarization controller which based on squeezing fiber and has variable delay quantity are suitable for high speed optical communication system.(2) The reset principle of the typical four channel polarization controller which is based on squeezing fiber is analyzed, and the design of its concrete reset scheme is given based on them. The reset process and the corresponding operation list are given in detail.(3) The systematical experiment is made when the typical four channel polarization controller is put into the PMD compensator. The experiment result showed that the channel which needs reset can efficiently return to the mean place, and the effect of reset was good, it didn't cause any badness infection on PMD compensation.(4) A new type optical signal time-domain depolarizer is given, and a new PMD compensate method is given based on it.

由此得出延迟量可变型光纤挤压型偏振控制器适用于高速光通信系统的结论；(2)具体分析了典型的四通道光纤挤压型偏振控制器的复位原理，并在此基础上对其进行了具体复位方案的设计，给出了各种情况下的详细复位流程和相应的复位操作列表；(3)将四通道光纤挤压型偏振控制器应用于偏振模色散补偿器中进行系统实验，实验结果表明，需要复位的通道能有效地回到中间值，复位效果良好，且复位未对PMD补偿产生不良影响；(4)设计了一种新型的光信号时域退偏器，并基于该退偏器提出了一种新型的偏振模色散补偿方法。

"I wish I had a photo to share of this very true story but any ponder with cats has likely had the same experience at some time or another. Several years ago, when I was enjoying the second season of my first pond (I have now built four as I've moved around), one of our cats,"Smokey", who was a natural hunter in her prime, saw a mockingbird alight on a lilly pad to get a drink of water. Well, old "Smokester slowly crept out from under some day lillies and made a spectacular jump with all four paws majestically carrying her like a flying squirrel, right for that intruding bird.

"我真希望我的照片分享这个非常真实的故事，但任何思考与猫狗都有可能有相同的经历，在某个时候或另一几年前，当我在享受第二个赛季的我的第一个池（现在我已经建成4个，作为我已经让周围），我们的一个猫"的smokey "，他们是非常自然的猎人，在她风华正茂，看到一只知更鸟下车，就来垫，以获得喝水，那么旧的" smokester 慢慢来逐步脱离，有一天声声，并提出了壮观的跳跃与所有四个熊掌majestically进行，她像一个飞鼠，右为入侵的鸟。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。