n.粉笔,白垩;
v.用粉笔画(或写);
例句:
Describe a circle on the floor with a piece of chalk.
在地板上用支粉笔画个圆.
He crushed a piece of chalk to powder.
他将一支粉笔压成粉末.
The rest of us hadn't finished our drinks, not by a long chalk.
我们其余几个人还没有喝完,还差得远呢。