able to be used for a practical purpose or in several ways 有用的,实用的,有效的 aspirins are useful for headaches. 阿司匹林治头疼有效。 ■(informal)very able or competent in a particular area (非正式)(特定领域)有能力的;胜任的 a useful pace bowler. 胜任的快投手。
常用词组 make oneself useful
do something that is of some value or benefit to someone 做对人有利的事 make yourself useful—get Jenny a drink. 做点好事——帮珍妮拿杯饮料。