having no openings to allow water to get in防水的,水密的;不透水的
(of a theory, plan, or agreement) formed very carefully in every detail so that nothing is uncertain or in doubt(理论、计划或协议)严密的,无懈可击的,毫无破绽的
UK If a football team has a watertight defence, it stops an opponent from scoring a goal. (足球队防守)滴水不漏
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