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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	feast one's eyes on feast or famine feat feather featherback feather bed feather boa feather-brain feather-brained feather cut feather duster feather duster worm feathered feathered friend feather edge feather foot feather-headed featheriness feathering featherless feather-light feather one's (own) nest feather star feather stitch feathertail glider

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