Retropulpitis
逆行性牙髓炎
??? 情景例句
If you go camping, at night you'll hear all the nocturnal animals.
如果你去野營(yíng)，晚上可以聽到動(dòng)物的夜歌。
He's a teather.
他是教師。
Er, is it under that window?
是在窗戶下面嗎？