/ˈju:sfl ||; ˈjusfəl/adj having some practical use; helpful 有用的；实用的；有益的:
a useful tool 有用的工具useful advice 有益的建议 ➔usefully /-fəli ||; -fəlɪ/ adv ➔usefulness noun [U] come in useful to be of practical help in a certain situation 有实际帮助；派上用场: Don't throw that box away -- it might come in useful for something. 不要把那箱子扔掉─也许还能派上什么用场呢。