Conodont
n. [古生]牙形刺, 牙形石
🗣️ 情景例句
You know, man's best friend is his dog.
你知道的，类最好的朋友就是狗。
I seldom write a letter.
我很少写信。
For our purposes, we are concerned only with one kind of cost----
就我们的目的而言，我们只关心一种费用-