单词	non-return
释义	non-return /ˈnɒnrɪtəːn / adjective Permitting the flow of air or liquid in one direction only: a non-return valve... If it is taking in air it means that the non-return valve is leaking and needs to be replaced. Self-sealing crashworthy fuel tanks have explosion suppression and non-return valves. A non-return flap is usually fitted to prevent cold air coming in.
随便看	mantay mante manteau Manteca mantee manteel Mantegna, Andrea Mantegnesque mantel mantelboard mantel clock mantelet Mantellata mantelletta Mantell, Gideon Algernon mantelpiece mantel-place mantelshelf manteltree mantic -mantic manticism manticore mantid mantie

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