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	programme girl programme junction programme line programme music programme pencil programme picture programmer programme service programme symphony programme trading programming programming language programmist program pencil program picture program register program service program step program symphony progrediency progredient progress progress chaser progress-chasing progression

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