Antrum
n. 窦, 房\\n[医] 窦, 房
🗣️ 情景例句
We usually accept payment by irrevocable L C payable against shiping documents.
我们一般用不可撤销信用证，凭装运单据结汇付款方式。
I tried to call you, but the line was busy.
我试着给你打电话，但老占线。
Right.
好的。