Chronic gingivitis
[医] 慢性龈炎
🧩 词语组成解析
n. 齿龈炎
🗣️ 情景例句
An oil tanker ran aground and lost about 15,000 gallons of gas into the sea.
一般油轮搁浅，把 15000 加仑油倾泻在海里了。
By doing we learn.
经一事，长一智。
The seeds must be carefully chosen; they must fall on good ground;
那就必然从精选良种做起，然后将其植入肥沃的土地，