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
Your grandfather went to the Engineering School there.
你爷爷进那个工学院。
Please make an offer indicating the packing.
请报价并说明包装情况。
CUSTOMS OFFICER: Are you tourists?
你们是来旅游的吗？