Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
Ask-Bob-to sit-behind-me.
让鲍伯坐在我后面。
The student felt very shy as he stood in front of the class.
那个学生站在大家的跟前时，感到非常难为情。
I cannot express how glad I am to hear from him.
我无法表达我接到他的信时有多高兴。