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问题: 翻译一句话~~~

由于人井F1的出水管暴露在人井外,且已锈蚀腐烂,完全失去了排水功能。故F1下游排水渠需重新铺设。

解答:

AS the outlet pipe of well F1 is exposed,it has completed rotten,and lost the drainage function,so we have to rebuilt the downstream offtake.