Principium
n. 原理, 基本原理
🗣️ 情景例句
Except for the beard, he hasn't changed in fifty years.
除了有胡须， 他五十年来没有变。
We must listen carefully to the teacher.
我们必须注意听老师说的话。
What about your inside pocket? Maybe you put it there.
里面的口袋呢？或许你把它放在那儿了。