usefulness是什么意思

实用例句

1. The UN is an organisation which has long since outlived its usefulness.

联合国是一个早已形同虚设的机构。来自柯林斯例句

2. There are doubts about the usefulness of these tests.

这些试验是否有用，人们有所保留。来自《权威词典》

3. The report is of potential usefulness to the government.

这个报告可能对政府有用.来自《简明英汉词典》

4. I was persuaded of the usefulness of his new device.

我相信了他的新装置的实用性.来自《简明英汉词典》

5. The index adds appreciably to the usefulness of the book.

索引明显地增加了这本书的实用价值.来自《现代英汉综合大词典》