Investigable
a. 可調查研究的
??? 情景例句
It's common practice.
這是慣例。
She is very fed up about it.
她對此非常不滿。
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支筆拴在重物上，筆尖落在地板上的一張紙上，