Sinal
a. [医]窦的
🗣️ 情景例句
Why do prices always go up during Spring Festival?
为什么春节期间很多东西都会涨价？
My head has been hurting.
我头痛。
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支笔拴在重物上，笔尖落在地板上的一张纸上，