时段

At last, we obtain that benefits of multi-annual average waterlog control in 1990-2004 is obviously higher than in 1949-1990. It proofs that benefits of waterlog control in Liaohe River Basin starts to rise obviously in the 1990s and has remarkable benefits of waterlog control.

分析结果表明，后一个时段多年平均治涝效益明显高于前一个时段的，说明辽河流域治涝效益自20世纪90年代后呈上升趋势，效益显著。

Digital signature algorithm DSA is firstly used in confirmer signature and the new scheme has complete convertibility.

目的在于提供所谓的前向安全性：既使当前时段的秘密钥泄露没，对手也不能伪造与过去时段有关的数字签名。

Study on the driving forces of land use/cover temporal-spatial change. On the basis of the systematical study on natural and social-ecomic factors including climate, population, technology and affluence status etc. during the past 50 years in this area, the multivariate statistics simulation models of LUCC were developed for two periods of 1950's-1980's and 1986-2000 respectively. Then, the Thiesson polygon method was used to the spatial allocation of soci-economic factors, thereby the spatial relationship between land use degree change and socieconomic factor variation was detected within GIS. Based on the analysis of the integrative characters in different geographical divisions, the electivity index was employed to describe the possible impacts of the natural landscape structure on spatial differentiation of land use transition. At last, correlation analysis between major roads and the distribution of land use change was made.

分析近50年气候资料和人文因子在不同年代的变化特点，系统地研究了气温和降水等自然因子和人口、农牧业发展、经济状况等人文因子对区域土地利用变化的影响；从时间序列的角度分析了50年代至80年代初和80年代中期至2000年两个时段土地利用／土地覆被变化的驱动因子，在相关分析的基础上，分时段建立了区域土地利用／覆被变化的自然-人文影响统计诊断模型；针对不同经济类型区选择典型县，分析近15年土地利用变化外在人文驱动力的区域相似性和差异性；尝试以THIESSEN多边形方法进行社会经济统计数据的空间化处理，探讨了土地利用程度变化与人文因素变化的空间相关关系；以优先指数模型和土地利用类型转化率与距交通干线距离的相关模型分析了景观自然与人文结构对土地利用空间转化过程的影响。

The idea of recruiting "shi", as a conception of longue durèe, was an important reason for the longevity of the imperial examination system.

取士的观念作为一种长时段观念构成科举制度长期存在的一个重要原因。关键词：科举；观念史；长时段

Vascular endotheliocyte fluorescence staining and leukocyte fluorescence tracing method were applied, in combination with microscopic video system and computer imaging analyzing system, to observe in dynamic and quantitatively the influences of acupuncture on pia matral encephali microvascular morphology, density and blood flowing velocity at 3 hours, 6 hours and 24 hours after cerebral occlusion of meddle cerebral artery.morphology, density and blood flowing state at various time divisions observed directly microscopically and vascular endotheliocyte morphology and the state of brain tissue which near the microvascular after infusion with velocity in infarcted area at various time divisions measured in quantity in each group.microvascular endotheliocytes were colored worse and more fluorescent exudation appeared.

采用血管内皮细胞荧光染色及白细胞荧光示踪法，结合显微录像系统和计算机图像分析系统，动态定量地观察了针刺对大脑中动脉阻塞后3，6，24h软脑膜微血管形态、密度、血流速度的影响。主要观察指标：①从显微镜下直接观察各组大鼠不同时段软脑膜微血管的形态、密度、血流状况，以及注入荧光剂后血管内皮细胞形态和周围脑组织状况。②定量测量各组大鼠不同时段梗死区微血管密度、血流速度。结果：120只大鼠均进入结果分析。

The result shows that from a long-term view-point, there is a close correlation between ozone layer change/solar activity and the annual incidences of the ECM/HP; and froma short-term view-point, the seasonalvariation of incidence might be associated with the variation of somemete orological factors.

结果表明，从较长时段看，臭氧层变化、太阳活动与ECM、HP年性病率间存在著较为密切的相关关系；从较短时段看，发病率的季节变化与某些气象因数的变化有一定的关系。

Chinese historical documents are a major source of paleoclimatic and environmental information.

我国的历史文献记录是古气候、古环境信息的重要来源，对古全球变化研究计划的目标时段——近2000年（人文记录和自然记录并存的时段）来说，尤其具有重要的科学价值。

Lighting is dark and sombrous, thats best time to look. all blemishes will be hidden by sombrous lighting.

我最好的时段在玩上，灯光昏暗，最好的时段吧，所有的不完美全被昏暗的灯光掩盖了。

By means of the results of ordinal regression analysis, this study discovers phenomena as follows: in a single automobile which runs off the road, the main factors are such as the use of cell phone and seat belt, drinking alcohol, violative behavior, trip purpose, timing, visibility, and road quality; in a single automobile which hits islands, the key factors are consist of driver's license and qualification, the use of cell phone and seat belt, trip purpose, visible distance, road visibility, road quality, and limited speed; in a single automobile which hits the roadside objects, the primary factors include the use of cell phone and seat belt, driver's license and qualification, drinking alcohol, violative behavior, age, timing, trip purpose, and region.

由顺序回归分析结果可知影响事故严重度的关键因素。在冲出路外的单一小客车事故中，关键因素为行动电话使用情形、安全带使用情形、饮酒情形、违规行为、旅次目的、时段、道路能见度和铺面品质；在撞路中物体的单一小客车事故中，关键因素为驾驶执照、驾驶资格、行动电话使用情形、安全带使用情形、旅次目的、道路视距、道路能见度、铺面品质和速限；在撞路旁物体的单一小客车事故中，关键因素为行动电话使用情形、安全带使用情形、驾驶执照、驾驶资格、饮酒情形、违规行为、年龄、时段、旅次目的和地区。

The results show that 42.86% topsoil samples are polluted by Cadmium, soil synthesis pollution index is moderate, Cadmium pollution degree of topsoil correlate with the environment of sampling sites. The results also show that exchangeable Cd, carbonate-bound Cd, organic-bound Cd and residual Cd are found in all soil samples except for Fe-Mn oxide-bound Cd. Furthermore, the concentration of exchangeable Cd and carbonate-bound Cd, both which have high biological validity, is high. Humus has a certain correlation with exchangeable Cd, organic-bound Cd and residual Cd, and has no obvious correlation with other chemical speciations. Any chemical speciation of Cd has no obvious correlation with pH and total Fe of soil samples. Cadmium in topsoil can be eluviated by acid solution, the quantity of Cadmium eluviated by redistilled water is little. With the rise of pH of eluviating solution, eluviated Cadmium quantity decrease. For the same soil sample, the lower pH value of eluviating solution is, the more fast the Cadmium is eluviated, and the more thequantity of Cadmium is eluviated.

研究结果表明：成都市表生土壤样中有42.86%受镉污染，镉综合污染水平达中度污染，成都市表生土壤镉污染程度与采样点周围环境表现出一定的相关性；除铁锰氧化物结合态镉在部分土壤样中未检出外，所有土壤样均含有可交换态镉、碳酸盐结合态镉、有机结合态镉、残留态镉，且生物有效性较高的可交换态镉和碳酸盐结合态镉占总镉量比例较高；成都市表生土壤中的腐殖质与可交换态镉、有机结合态镉、残留态镉有一定相关性，与碳酸盐结合态镉、铁锰氧化物结合态镉相关性不显著；各形态镉与土壤pH值和全铁的相关性均不显著；土壤中的镉可被酸溶液淋出，重蒸馏水淋出镉量十分微小；随着淋滤液pH值的升高，土壤样的镉淋出量下降，且0～5小时时段的镉淋出量占镉总淋出量比例下降，5～30小时时段的镉淋出量占镉总淋出量的比例上升，对同一土壤样而言，酸度大的淋滤液比酸度小的淋滤液淋出镉速度更快，淋出镉量更大。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失