Predentin
前期牙(本)質, 原牙質
??? 情景例句
That's nothing at all.
不用客氣。
Three removes are as bad as a fire.
三次搬家猶如一次失火。
You can imagine how useful this is, particularly in countries like China and Japan, which use written characters not letters.
你可以想像得到，特別是在中國和日本這些使用文字而不是字母的國家，這是多么有用處！