Cemental decay
[医] 牙骨质腐蚀
🧩 词语组成解析
a. 白垩质的
🗣️ 情景例句
The signs of the city never fail to impress the foreign tourists.
外国游客无一不对该城市留有深刻的印象。
Sorry to have kept you waiting.
抱歉使你久等了。
He ate simply, and never ate meat. He rose early in the morning and worked at his wheel, making cotton thread.
他吃得很简单，且从不吃肉。他每天早晨早早就起床，转动纺车，纺棉纱。