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	levitation levitator Levite Levitical Leviticus Levittown levity levo- levodopa levonorgestrel levorotatory levulose levy lewd lewdly lewdness Lewes lewis Lewis acid Lewis and Clark Trail Lewis and Harris Lewis base Lewis, Carl Lewis, Cecil Day Lewis, C. S.

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