useful/ˋjusfəl; ˈjuːsf$l/adj something that is useful helps you to do or get what you want [ useless ] 有用的﹐有帮助的: a useful book for travellers 一本对旅行者有用的书+for Trade fairs are useful for meeting new clients. 交易会对结识新客户很有用。It's useful to make a list before you start. 先列一个表再动手是很有帮助的。His knowledge of Italian was to come in useful (=be useful) later on. 他学的意大利语后来派上了用场。—usefully adv —usefulness n [U]