双叶的

The author not only presents pseudo sphere, ellipsoid ,conoid,uniported hyperboloid,elliptic biparted hyperboloid,paraboloid and hyperbolic paraboloid of the second elemental form,but also curve of the second elemental form.

不但给以了伪球面、椭圆面、劈锥曲面、单叶双曲面、双叶双曲面、椭圆抛物面及双曲抛物面的第二基本形式，而且给以了一般曲面的第二基本形式。

Using six monocotyledonous and dicotyldonous weeds and the plant shoots and soils as materials, all the compounds were tested indoors on the herbicidal activities. The results showed that one or two compounds have a definite herbicidal activity.

2所有化合物在室内分别对单子叶和双子叶的六种杂草，采用茎叶和土壤两种处理方法，进行了除草活性试验，结果有1—2个新化合物显示一定的除草活性。

Two special structural features of the sulfonium salt were proved to stabilize its corresponding ylide and depress the 2,3-sigma rearrangement. One is that there is a trimethylsilyl in the end of the allylic double band. This silicon atom can stabilize a α-carbon anion and the corresponding ylide. Another is that there is hydroxy group in the beta-position of sulfonium atom. The oxygen of this hydroxy group may stabilize the sulfonium cation.

为了稳定生成的烯丙基硫叶立德，并抑制它的2， 3-sigma 重排反应，在硫叶立德结构上做了两方面的考虑：一是在烯丙基双键的未端引入硅基，利用硅原子对 a -碳负离子的稳定作用来稳定烯丙基硫叶立德；二是在硫原子的 b -位引入羟基，利用羟基氧对硫正离子的作用来稳定硫叶立德。

This is a bifoliate aluminium makes open bridge, by the bicycle, on foot with motor vehicle 3 kinds of driveway are comprised, have a bridge tower that is as high as 60m.

这是一座双叶的铝制开启桥，由自行车、步行和机动车三种车道组成，并有一座高达60m的桥塔。

The physical risk identification task, however, resulted in stronger sustained activity in the right cuneus/precuneus and increased transient activation in bilateral amygdala.

但是身体风险识别任务导致在右侧楔叶/楔前叶的持续激活以及在双侧杏仁核的短暂活动。

Comparison results revealed that there was significantly reduced functional connectivity in the left posterior cingulate cortex, vbilateral anterior cingulate cortex, bilateral medial prefrontal cortex, left parahippocampal cortex in MHE patients, while functional connectivity increased in the right precuneus.

但与正常对照组相比，MHE患者大部分脑缺省模式网络脑区功能连接降低，包括：左侧后扣带回、双侧前扣带回、双侧额中回、左侧海马旁回；而右侧楔前叶的功能连接较正常对照组升高。

This malignancy is characterized by concomitant existence of carcinomatous and sarcomatoid components. Complete tumor excision typically leaves a considerable defect. This report presents a case of a 60-year-old male with carcinoscarcoma of the right chest wall who underwent wide excision. Reconstruction was achieved with lateral thoracic fasciocutaneous flap applied in a bibbed manner that allowed for low tension on the anastomosis.

这类肿瘤的特色是同时含有癌症及类肉瘤的成份所组成，肿瘤完全切除后通常会遗留下可观的缺损，我们提出一个60岁男性病患利用双叶侧胸动脉皮办重建胸部癌肉瘤的病例报告，双叶性的设计有助於伤口张力的降低。

Positive correlation between verbal fluency and FA in both anterior limbs of internal capsule, left external capsule and the white matter of left occipital lobe were demonstrated by bivariate correlations.

结论DTI显示额叶癫疴患者右侧额叶MD值明显增高、右侧外囊、尾状核和双侧丘脑的FA值明显减低，提示额叶癫痫患者在上述区域可能存在细微病理改变，执行功能可能超出前额叶的范围。

Frame for sliding grilles with one or two leaves.

带单叶或双叶格纹拉窗的框架结构。

Considering many biophysics processes such as the atmosphere,hydrology,plant leaf N content et al.a multiple layer,two-leaf canopy model for predicting of mass transportation and energy exchange between plant canopies and the atmosphere has developed after dividing the canopy height into three layers,and the sunlit and shaded leaf area index was computed respectively at different layers through introducing a foliage clumping index,it is important to distinguish the spatial light distribution and so leaf photsynthesis.

多层—双叶模型对冠层上方碳通量的模拟：综合考虑农田水、热因子及叶片氮含量的非线性垂直分布对碳、水循环的影响，将农田按植株高度分为上、中、下三层，并通过叶片集聚指数计算阴、阳叶面积以区分叶片的空间分布受光状态，建立了均匀农田与大气间物质输送和能量交换的多层—双叶模型，对农田冠层上方基于光合—呼吸的碳循环过程进行了模拟应用研究。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。