watertight

形容词 watertight:

1. not allowing water to pass in or out
2. without flaws or loopholes
   同义词：unassailable, unshakable, bulletproof

1. As soon as the alarm went, the crew raced round shutting the watertight doors.
   警报一响，船员们跑来跑去把船上的密封门关紧。
2. Is this roof completely watertight?
   这屋顶一点也不漏吗？
3. A watertight cylindrical vessel, open at the top and fitted with a handle; a bucket.
   桶一种不漏水的圆柱形容器，顶部敞开并安有把手; 水桶

wa.ter.tight

adj.（形容词）
So tightly made that water cannot enter or escape.
水密的：制造之紧密以致水无法进入或漏出的
Having no flaws or loopholes; impossible to fault, refute, or evade:
无懈可击的：没有瑕疵或漏洞的；不可能错误、反驳或回避的：
例句：
a watertight alibi; a watertight contract.
无懈可击的借口；严密的合同