Gingival trough
[医] 龈沟
🧩 词语组成解析
a. 齿龈的\\n[医] 龈的
trough
['trɔ:f]
n. 水槽，食槽;低谷期;[航]深海漕;[气]低气压槽;
🗣️ 情景例句
This is as useful as screen door on a submarine.
这毫无用处。
Do you have the tickets, or not?
你到底有没有买票？
If you recognize yourself in this description,
如果你觉得你的情况是这样的话，