vt.减去;扣除;
例句:
Let's subtract ninety from the hundred years and rear people in ten.
百年树人,减少九十年,十年树人.
If you subtract 2 from 8, you get 6.
8减去2是6.
In their first year at school, most children learn to add and subtract.
入学第一年, 多数孩子都学加减法.