尿道的作用当然是让一条河流通过它。
The purpose of the urethra is certainly to have a river run through it.
今天，河流控制的原因有很多，主要是为了维持可靠的水资源供应，以满足日常生活、农业和工业、发电、航行的用水需要，并起到防洪作用。
Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation, and to prevent flooding.
山体细粒沉淀物在冰川与河流活动的作用下被冲刷下来，接着被风吹走或水流带走。
The actions of glaciers and rivers scrape away fine sediment, which is carried away by water and wind.
森林因其提供的多方面产品，在很多方面都有着重大作用，西方纳税人需要亚马逊热带雨林帮助控制气候变暖，巴西人需要雨林让河流长流水，让水力发电机能发电，亚马逊流域的豆农需要雨林带来足够的降水。
Western taxpayers need the Amazon rainforest to control their climate. Brazil needs it to help feed its rivers and generate hydro-power.
形成我们农场东部边界的一条河流一直在我们生活中发挥着重要作用。
The river which forms the eastern boundary of our farm has always played an important part in our lives.
实际上，这种现象在宇宙中很普遍，图中南天星座波江座(河流星座)河岸中这醒目的一对相互作用星系就是例子。
In fact, the practice is common in the universe and illustrated by this striking pair of interacting galaxies from the Banks of the southern constellation Eridanus (the River).
研究结果表明轮虫在河流生态系统中具有重要作用。
Results indicated that rotifers played an important role in river ecosystems.
我们发现融化的水在印度河流域和Brahmaputra是如此之重要，而在扬子江流域却仅仅起着不太大的作用。
"We show that meltwater is extremely important in the Indus basin and important for the Brahmaputra basin," they wrote, "but plays only a modest role for the Ganges, Yangtze and Yellow rivers."
树木所起的作用不止于保持水土。树木还吸收水份、防止洪水突发，并使河流不至于含有可杀死鱼类的泥沙沉淀。
Trees do more than keep the soil in place. They also soak up water and prevent flash floods, and keep rivers clear of sediment that can kill fish.
张芳枝。河流冲刷作用下的堤岸稳定性研究。暨南大学博士论文，2010年。
Zhang Fangzhi. Research on Stability of Embankment under Effects of River Scouring. Jinan University, 2010.
大峡谷是河流侵蚀作用的产物。
河床河岸地质结构对河流地质作用的制约主导着河道演变的趋势。
The restraint of geologic structure of river bed and bank on the rivers geologic action controls the river evolution trend.
河流中叶片凋落物在春夏季节的快速分解对底栖生物群落和下游养分循环有重要作用。
Generally, fast breakdown rates of leaf litter in the Xiangxi River indicated that riparian leaf litter played a significant role in the nutrient cycling and benthic communities.
碎屑沉积物衍生自陆地物质，大部分以铝硅酸盐矿物形式存在，由河流和风的作用而沉积于海洋。
It derives from land materials, mostly in the form of aluminosilicate minerals, and is deposited in the ocean by rivers and wind.
山区河流发育的阶梯—深潭系统具有显著的生态学作用。
The development of step-pool system plays an important role in stream ecology.
反滤作用：用于河流堤，坝公路铁路，机场路基，挡土墙回填土，边坡等岩土工程，提高稳定性。
Filtrate: it can strengthen in geotechnical engineering such as riverbank dam highroad railway roadbed of airport etc.
河流泥沙是流域内各种自然因素和人为因素综合作用的反应，与河道本身冲淤变化密切相关。
River sediment yield is the reaction of various natural factors and human action factor comprehensive role in basin, wash with sedimentation of river course to change, is related closely.
地质构造作用，控制河流的走向和流势；
The geological structure controls the trend and the flow of the river.
由于构造破碎和河流切割引起岩石卸荷与松动，使岩石有利于水的渗入和岩溶作用。
Due to the unloading and loose - ning brought about by tectonic shattering and river cutting, the mud limestone becomes favorable for water infiltration and karstification.
本文分析了河水与地下水不同作用形式下的补排关系，给出了河流在地下水流模拟中的两种处理方法。
The article analyzes the relation between recharge and discharge under the different function of groundwater and stream and given two treated methods for stream in groundwater flow simulation.
长江不是世界上最长、最宽或作用最大的河流。
The Yangtze River is not the longest, the widest, or the most powerful river in the world.
河道的演变与河流的地质作用密切相关，而河流地质作用受到河谷地质结构的制约。
The river evolution and its geologic action are closely correlative, and the geologic action of a river is restricted by the geologic structure of the river valley.
沙质沉积物主要来源于现代流水作用、干涸湖泊和河流故道。
The sandy materials mainly originate from modern fluvial action, dry lake deflation and older river courses.
特别是在与冲积物相比较时，河流沉积趋向于分选得很好，因为河流提供了较稳定的搬运作用。
Fluvial deposits tend to be well sorted, especially in comparison with alluvial deposits, because of the relatively steady transport provided by rivers.
另外碳氮同位素及其比值在当前的河流有机质生物地球化学研究中仍起着非常重要的示踪作用。
In addition, carbon and nitrogen isotope and its ratio was important indicator in the riverine biogeochemistry study.
河流沉积学的研究不但具有重要的理论意义，而且对生产实践和洪灾防治具有重要的指导作用。
The research in fluvial sedimentology is significant not only for theory but also for practice of mine production and flood controlling.
结果表明：在本实验条件下，淮河流域(江苏段)沉积物对三氯苯的吸附等温线呈线性，分配作用占主导地位。
The results indicate that the sorption isotherms of trichlorobenzene to sediment in Huaihe River (Jiangsu reach) are linear in the experiments condition, and distribution plays a leading role.
河流随着水的作用流向发生变化，会侵蚀河流流经的岩石。 。
Thee changing course of a river channel as the action of the water wears away the rocks past which the river flows.
该计划的目的是研究亚马逊河流域的生物地球化学、水文学、沉积作用等方面的问题。
The purpose of this research project is to understand the biogeochemistry, hydrology, and sedimentation of the Amazon River and its drainage basin.
该计划的目的是研究亚马逊河流域的生物地球化学、水文学、沉积作用等方面的问题。
The purpose of this research project is to understand the biogeochemistry, hydrology, and sedimentation of the Amazon River and its drainage basin.
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