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.

由于人井f1的出水管暴露在人井外，且已锈蚀腐烂，完全失去了排水作用。故f 1下游排水渠需从新铺设。

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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.

由于人井f1的出水管暴露在人井外，且已锈蚀腐烂，完全失去了排水作用。故f 1下游排水渠需从新铺设。

youdao