Mechanical seal
[化] 机械密封; 端面密封
🧩 词语组成解析
seal
[sil]
n. 密封;印章;海豹;封条;
v. 密封;盖章;决定;封上（信封）;
🗣️ 情景例句
if it's all right with your dad.
假如你爸爸答应的话。
I'd like to try on this sweater.
我想试穿这件毛衣。
Tie a heavy weight at the end of a long piece of string.
把一个重物拴在一根长绳子的一端，