这些河流和河川系统被称作“外源河流”，因为它们的源头位于干旱地区之外。
These rivers and river systems are known as "exogenous" because their sources lie outside the arid zone.
当农民开始在河川系统的泛滥平原沿岸种植庄稼的时候，真正的突破发生了。
The real breakthrough took place when farmers began to cultivate crops along the floodplains of river systems.
介绍环境流场中的动量及纯量传输，主要着重于河川和湖泊系统的探讨。
Introduction to momentum and scalar transport in environmental flows, with emphasis given to river and lake systems.
河川径流作为水循环水文要素之一，由于受人类活动、流域气候及自然地理等因素的综合影响，其变化呈一个非线性动力系统。
As one of the main hydrological factors of the water cycle, river runoff is affected by human activities, watershed climate and geographical factors, and its change is a non-linear dynamical system.
河川径流作为水循环水文要素之一，由于受人类活动、流域气候及自然地理等因素的综合影响，其变化呈一个非线性动力系统。
As one of the main hydrological factors of the water cycle, river runoff is affected by human activities, watershed climate and geographical factors, and its change is a non-linear dynamical system.
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