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	sodium carbonate sodium chloride sodium cromoglycate sodium cyanide sodium hydroxide sodium lamp sodium lauryl sulphate sodium morrhuate pigmoid pig mold pig mould pigmy pig net pignoli pignolia pignon pignorate pignoration pignorative pignut pig-out pig-pail pigpen pig philosophy pig pile

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