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
I can take the bus to work ...
我可以坐公共汽车上班……
I dialed the right number,but nobody answered.
我拨了正确的号码，但是任何人接。
Would you like to do that now?
你要现在就讨论吗？