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
I care about the school buildings in need of paint.
我关心学校的建筑物需要粉刷。
Would you please open the door for me?
请你帮忙开个门好吗？
Letter
2第二封信