Valving
装设阀门
🗣️ 情景例句
In fact, I'd like your autograph.
事实上 我想要你的签名。
Especially to Katherine Miller, for being there when I needed her.
特别是感谢凯瑟琳.米勒，每当我需要她时，她总在我身边。
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）