useful work短语⁹⁰⁸⁸⁷⁺⁷ 基本例句 有用功 Convincing engineers to pay more attention to patent applications necessarily means that they spend less time doing useful work, and that can be fatal to a young startup. 说服工程师花更多的时间考虑专利申请,就意味着他们干正事的时间少了,这对创业公司来说是致命的。 yeeyan Not only does that heat do no useful work, it also damages machinery. 这种热能非但无用,甚至还损害机器。 yeeyan