| 例句 |
noun There are doubts about the usefulness of these tests. 这些试验是否有用，人们有所保留。 The building has outlived its usefulness. 这座楼房已超过使用年限了。 Many people claim that the word has lost its usefulness. The advisory group has outlived its usefulness. The report is of potential usefulness to the government. The theory is of limited usefulness. the drug’s usefulness in the treatment of cancer the exam’s usefulness for ranking students |