Retainer seal
[化] 护圈密封
🧩 词语组成解析
retainer
[ri'teinə]
n. [机]承盘，挡板;家臣，侍从;[牙科]牙架;保持着;
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
and I have to go to the hospital.
我得赶去医院。
Please turn in your paper before leaving.
请在离开前将论文交上。
How much is the pen?
这支笔多少钱？