upper reaches (of a river)
(河的)上游
以上为机器翻译结果,长、整句建议使用 人工翻译 。
Sometimes, a flash flood in the upper reaches of a river system can evolve into a more general river flood as it joins with other inflows and spreads out as it travels downstream.
有时,河系上游产生的山洪随着其他支流来水的陆续汇集,可演变成为一个比较和缓的河道洪水,向下游演进。
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