Delta seal
[化] 三角密封
🧩 词语组成解析
delta
['deltə]
n. 希腊语字母表第四字母δ;（河流的）三角洲;[数]变量增量;
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
All right.
还好呢。
Put the cart before the horse.
本末倒置。
It must have been about two in the morning when I returned home.
我回到家时，肯定已是凌晨两点左右了。