或用质地软有弹性不透气的橡胶板遮盖在地漏上。
Or texture of soft flexible rubber airtight floor drain in the cover plate on.
我的鼻子不透气。
闸阀和截止阀(金属与金属连接)阀座不具备不透气关闭的性能。
Gate and globe metal to met seats cannot provide bubble tight shut-off.
闸阀和截止阀(金属与金属连接)阀座不具备不透气关闭的性能。
Gate and globe metal to met seats cannot provide bubble tight shut-off.
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