Gemmology
n. 宝石学
🗣️ 情景例句
They don't ask how much someone paid for something.
他们不问别人买某个东西要花多少钱。
Speak of the devil.
我们才刚好聊到你而已。
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。