... 排水孔;去水孔：drain hole 排水坑道：adit for draining 排水径：drainage path ...
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oil wet drainage path 亲油泄油通道
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Thus, the drainage path should be short enough, and water should be led to structual supports and should not be accumulated on the end of suspending elements.
排水路径要短，水流要向结构的支座处会聚，尽量避免聚向悬挑端。
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