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
Hello. Is Susan there?
喂，是苏珊吗？
All rivers run into the sea.
百川入海。
We're not treated as equal citizens.
我们没有被当作平等公民对待。