Vapourtight
汽密; 汽密的
🗣️ 情景例句
Grandpa,
爷爷，
Readiness is all.
有备无患。
a trough (the lowest point), a height (the vertical distance from the trough to the crest),
波谷（最低点）、浪高（从波谷到浪峰的垂直距离）