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
What did you do?
那你怎么办呢？
Napolean himself was once a crying baby.
即使是拿破仑，过去也是啼哭的婴孩。
It is the one world in the Solar System that is most like the Earth.
火星是太阳系里与地球最接近的一颗行星。