Preventology
[医] 牙病预防学
🗣️ 情景例句
Or at least give him some advice.
再不然至少可以给他一些忠告。
Don't worry he wiil bring something.
不要担心他会带来什么。
It was upon this principle that the first instruments were made,
据这一原理，制造出了最初的地震仪器，