subtract pulse

例句：

1. 1. The teacher subtracted 50 from the total number of students.
   老师从总学生人数中减去了50。
2. 2.The cost of the new car is 10,000 less than the old one.
   新款车的价钱比旧款车便宜10,000。
3. 3. The salesman subtracted the discount from the price before giving the final offer.
   销售人员在给出最终报价前，从价格中减去了折扣。