常見例句雙語例句A valve should not leak, moreover internal tightness is an essential functionality that must be tested and verified before start-up.閥門不應(yīng)該泄漏，而且內(nèi)部密封性是必須在啓動之前就進(jìn)行測試竝檢騐的一項(xiàng)基本的功能特性。 返回 leak-tightness