un. 止回阀;止逆阀;逆止阀 [网络] 单向阀;切断式止回阀;正向阀 ball non-return valve: 单向球阀; 球形止回阀; 球形止逆阀check (non-return) valve: 止逆阀double non-return valve: 双向止回阀; 双止回阀exhaust non-return valve: 排气止回舌阀extraction non-return valve: 抽汽逆止阀下载手机词典可随时随地查词查翻译