橡胶皮保护孔的边缘，以防止损坏电线电缆。

Rims of holes shall be protected by rubber to avoid any damage.

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所有的实习孔倒角对内部的优势，以防止破坏O型环在安装过程中的喷嘴和舱壁见工程。

All of the attachment holes are chamfered on the inside edges to prevent damaging the O-rings during installation of the nozzle and bulkhead see Eng.

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靠近洗手水池的顶部开有一个孔以防止水溢出。

Bathroom sinks have a little hole near the top that helps prevent overflows.

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