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
There has been very little progress this term.
这学期没有什么进步。
An idle youth,a needy age.
少壮不努力，老大徒伤悲。
Which speech are you going to?
你打算去听哪个报告呢？