词族 · usefulness
词形变化
权威例句
- 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。
- 2. There are doubts about the usefulness of these tests.
- 这些试验是否有用，人们有所保留。
- 3. The report is of potential usefulness to the government.
- 这个报告可能对政府有用.
- 4. I was persuaded of the usefulness of his new device.
- 我相信了他的新装置的实用性.
- 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.