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
Here's the bag.
箱子拿来了。
It's out of the question.
这是不可能的。
There was a good talk about the increase in the world's population.
有个关于世界人口增长的谈话，很不错。