Gingival sulci
[医] 龈沟
🧩 词语组成解析
a. 齿龈的\\n[医] 龈的
[医] 沟
🗣️ 情景例句
And he's agreed to fit you into his schedule.
他同意明天把你安排进他的面谈名单里 。
She's always helping people.
她总是帮助别人。[现在进行时]
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。