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下游河段
bridg.constr.	tail bay
el.	lower reach
eng.geol.	downstream water; lower river
hydroel.st.	downstream reach; lower reaches of river
tech.	downstream waters; lower course; lower stretch; plain tract
船闸的下游河段
tech.	lower basin; lower pond; lower pool
临近建筑物的下游河段
tech.	downstream bay
堤坝下游河段
tech.	downstream water

下游河段: 4 phrases in 3 subjects

Agriculture	1
Hydroelectric power stations	2
Technology	1