下游的

Nile downstream irrigation since ancient times, is a famous area, the Nile water fluctuations can lead to the fertile soil is conducive to a good harvest living in downstream Nyroth people, Beja people, Galla, the Somali people, life is closely linked with the Nile.

尼罗河下游自古以来就是有名的农业灌溉区，尼罗河水涨落可以带来肥沃的泥土，有利于农业丰收，生活在下游的尼罗特人、贝扎人、加拉人、索马里人，生活都同尼罗河息息相关。

The results were summarized as followings: the density of planktonic crustacea in middle reach was higher than that in the lower reach whereas the species abundance and community diversity index in the lower reach were higher than that in the middle reach; the planktonic crustacea communities presented high density but lower diversity in the upper part of the middle reach, lower density but high diversity in the lower part of the middle reach and estuary, and lower density and diversity in the lower reach except the estuary.

结果表明，汉江中下游江段浮游甲壳动物的密度分布呈现出中游高于下游的特征，而物种丰度和群落多样性指数则是下游高于中游；中游上段的属于密度高但多样性低的群落、中游下段和汉江口属于密度较低但多样性高的群落，下游除汉江口外属于密度和多样性均较低的群落。

The author analyzed the reasons of damage caused by "03·8"flood occurred in Weihe River from the general situation of the lower reaches of the river, the feature of the flood and the flaws of the dike, in hoping to give the reference for riverway engineering of the lower reaches of the Weihe River in the future.

从渭河下游的概况、"03·8"洪水的特点和渭河堤防工程的不足等方面对渭河"03·8"洪水造成的灾害原因进行初步探讨，以期对今后渭河下游的河道治理工程提供参考。

The large stem and loop structure can be constructed from the sequence surrounding the 5' and 3' ends of the 16S rRNA gene.The stem is about h alf shorter than that of tobacco,due to a 79 bp deletion in Brassica napus chlor oplast.

5%、96.1%。油菜叶绿体16SrRNA基因5＇端上游及3＇端下游的顺序能互补而形成一个较大的茎环结构，但与烟草相比，由于3＇端下游顺序有79bp的缺失，因此，该结构中的茎部分大小仅为烟草的二分之一。

The quasi-perpendicular collisionless shock consists of foot, ramp and a series of overshoots and undershoots, after travelling back upstream for a short distance, the reflected protons gyrate back into the downstream where an temperature anisotropy is formed due to an anisotropy of velocity distribution, then excite Alfvén ion cyclotron waves and mirror waves that dissipate the kinetic energy into heat; At quasi-parallel collisionless shocks, the reflected protons can travel far upstream, and lead to the generation of ion beam instabilities which excite large-amplitude right-hand polarized ultralow-frequency resonant waves whose frequencies are are about〓 These waves are convected back downstream by solar wind and gradually merge to form the downstream state, in the meantime new waves are generated continuously in the upstream, this process where ULF waves are generated and merge into downstream state is cyclical.

准垂直无碰撞激波系由根部、斜坡区以及一系列的低冲和过插组成，被激波反射的质子向激波上游运动很短的距离就在回旋作用下再次向下游运动，和激波发生相互作用以后进入激波的下游，在激波的下游引起质子速度分布的各向异性，进而引起激波下游温度的各向异性，激发起Alfvén离子回旋波和镜波，将激波上游的动能耗散成激波下游的热能；在准平行无碰撞激波(θ〓＝10°)情况下，这部分质子能向激波上游运动很大一段距离，并在激波的上游激发起束流不稳定性，引起大振幅的低频波动。

With development of man-made oases in headstream zone and upper and middle zone of trunk stream zone, the origin water resource system was destroyed. This caused a serial of ecological problem on tobogganing groundwater level, ruining Green Corridor, intensifying land desertification, etc.

源流区和干流上、中游人工绿洲的发展，破坏了原有自然水资源系统，使输往下游的水量不断减少至中断，从而造成塔河干流下游地下水位急剧下降、绿色走廊衰败、土地荒漠化趋势加剧等一系列生态问题。

The dike breach risk of the north bank is higher than the south bank in winding reaches.

本文提出黄河下游悬河决溢风险的影响因素应当包含水沙运动、区域地壳稳定性、河势演变和堤防稳定性4个方面，并据此建立了指标体系和基于GIS技术的多层次模糊综合评判模型，对不同洪水情景下黄河下游的决溢风险进行了评价。

Downstream from a lock or canal that is used to control the flow of water at the lower ''.

位于河流的下游用以控制下游的水流的一个闸门。

A gate downstream from a lock or canal that is used to control the flow of water at the lower end .

位于河流的下游用以控制下游的水流的一个闸门。

Article 3. For the purpose of these Regulations, the term Yangtze River Waterway shall mean the main waterway extending from the line joining Liuheiwu (31 Degree 30 52 N, 121 Degree 18 54 E) at the lower reaches of the Estuary of the Liu River, and the signal post (31 Degree 37 34 N, 121 Degree 22 30 E) at the lower reaches of the Estuary of the Shiqiao River, Congming Island, and upwards to the upper boundary of Zhangjiagang (a line joining point 31 Degree 59 35 N, 120 Degree 20 00 E and point 31 Degree 57 13 N, 120 Degree 20 00 E).

第三条 本规定所说的长江水域，是指自浏河口下游的浏黑屋（北纬三十一度三十分五十二秒、东经一百二十一度十八分五十四秒）与崇明岛施翘河口下游的施信杆（北纬三十一度三十七分三十四秒、东经一百二十一度二十二分三十秒）联线沿长江向上至张家港上界（北纬三十一度五十九分三十五秒、东经一百二十度二十分与北纬三十一度五十七分十三秒、东经一百二十度二十分联线）之间的干线水域。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。