usefulness

['ju:sfulnis]

n.有用, 有用性

例句与用法：

Consider the postage stamp: its usefulness consist in the ability to stick to one thing till it get there.

想想那邮票吧：其用处在于它能粘住一样东西直至达到目的为止。

A regulation that has outlived its usefulness.

已经没用却仍然存在的规则

When he retired he felt that he had outlived his usefulness.

他退休后觉得自己年老无用了。

Impairment of the usefulness or value of person or property; harm.

损害，破坏对有用或有价值的人或财产的破坏; 伤害

词形变化：

副词: usefully | 名词: usefulness |

详细释义：

n.

有用, 有益, 有效[U]

He has outlived his usefulness.

他已老而无用了。