例句：
1、This sport demands both speed and strength.
这项运动既需要速度也需要体力。
2、Righting the economy will demand major cuts in expenditure.
恢复经济需要大量削减开支。
3、It was a time of peak demand for the product.
那是对该产品需求最旺的时期。
4、The product was developed in response to customer demand.
这种产品是为了满足顾客的.需要而开发的。
5、By popular demand, the play will run for another week.
应广大观众要求，这出戏将加演一周。