watertight
adj. （容器或房间）防漏水的，水密的；（理论、计划或协议）严密的，无懈可击的
例句
The rules state that samples must be enclosed in two watertight containers.
条例规定样品必须用两个不漏水的容器封装起来。
《柯林斯英汉双解大词典》
If she could just establish the time the picture had been taken, Mick would have a watertight alibi.
只要她能确定拍这张照片的时间，米克就可以有一个无懈可击的不在现场的证据。
Only teak matches oak's expansion coefficient and stays watertight.
只有柚木才能达到橡木的膨胀系数，并保持水密性。
