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
Merry Christmas, Carl and David!
卡尔，大卫，圣诞快乐！
I'd say yor're about twenty-three.
我猜你大约23岁。
The teacher got a little angry.
老师有点生气了。