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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	pay one's compliments pay one's devoirs pay one's dues pay one's last respects pay one's (last) respects pay one's respects payor pay-or-play payout pay out of pocket pay packet pay party pay pause pay-per-click pay-per-view payphone pay raise pay restraint pay rise payroll payroller payroll giving payroll tax payroll vote paysage

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