demand可數(shù)還是不可數(shù)

　　例句：

　　1、This sport demands both speed and strength.

　　這項運動既需要速度也需要體力。

　　2、Righting the economy will demand major cuts in expenditure.

　　恢復(fù)經(jīng)濟需要大量削減開支。

　　3、It was a time of peak demand for the product.

　　那是對該產(chǎn)品需求最旺的時期。

　　4、The product was developed in response to customer demand.

　　這種產(chǎn)品是為了滿足顧客的需要而開發(fā)的。

　　5、By popular demand, the play will run for another week.

　　應(yīng)廣大觀眾要求，這出戲?qū)⒓友菀恢堋?/p>