use的前缀

usefully 通常；

usefulness n.有用，有益；

useless a.无用的，无价值的；

uselessly ad. 无用地；徒劳地；

user n.用户，使用者。

The money could be more usefully spent on new equipment.

这笔钱用来购置新设备可能会更有价值。

Your time could be usefully employed in attending to professional matters

你可以有效地利用时间处理一些专业问题。

Something of the same approach could usefully be adopted now across the West.

如今，整个西方都可以有效地采用类似的战略。

A man might usefully make a lifetime study of the impact of the motor car.

人们可以对汽车的影响力进行毕生的研究，这可能很有用。

His time could be more usefully spent.

他的时间可以用得更有价值。