Your time could be usefully employed in attending night classes.
你的时间可以被有效地利用来上夜课。
《柯林斯英汉双解大词典》
2
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。
《牛津词典》
3
The process can usefully be thought of in terms of the gradual emergence of two somewhat separate features: the self as a subject, and the self as an object.