Odontogen
[医] 牙质原
🗣️ 情景例句
you've been writing for the school paper.
你为校刊写文章。
Teach your grandmother to suck eggs.
班门弄斧。
What invariably happens is that a great number of things choose to go wrong at precisely the same moment.
情况经常是这样的，许许多多的事情都偏偏赶在同一时刻出问题，