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watercourse ['wɔ:təkɔ:s] n
gen.	水流〔路，道，系〕; 河〔渠，航〕道; 底线
hydroel.st.	水道; 河道; 溪; 河床; 水路; 水系; 河渠
tech.	水流; 河道
watercourse A natural stream arising in a given drainage basin but not wholly dependent for its flow on surface drainage in its immediate area, flowing in a channel with a well-defined bed between visible banks or through a definite depression in the land, having a definite and permanent or periodic supply of water, and usually, but not necessarily, having a perceptible current in a particular direction and discharging at a fixed point into another body of water adj.
environ.	水道 (在某一流域出现的自然流水，但并非完全依赖其邻近地区表面排水的流量，在堤岸间有明显的河底或通过明显的土地洼地的通道中流动，有明确的和永久或定期的水供应，并不一定有明显的特定的流动方向，通常定点地排入另一个水体。)

watercourse: 18 phrases in 8 subjects

Agriculture	2
Bridge construction	1
Ecology	1
Engineering geology	1
Environment	1
Hydroelectric power stations	3
Oil / petroleum	1
Technology	8