音标：['ju:sful]
a. 有用的, 有益的
【机】 有用的, 有效的
在线英汉词典

useful的短语、例句：

useful adj 1 that can be used for some practical purpose; serviceable or helpful 实用的; 适用的; 有用的; 有益的; 有帮助的
a useful gadget, book, hint, acquaintance 有用的小机械、 书、 线索、 熟人
do sth useful with one´s life 尽自己毕生精力做些有益的事
Videos are useful things to have in the classroom. 教室里有录像设备是很有助益的. 2 (infml 口) competent or capable 能干的; 有能力的
He´s a useful member of the team. 他是该队的主力队员. 3 (idm 习语) come in handy/useful => handy. ,make oneself `useful help by performing useful tasks 做些有用的事来帮忙
My nephews tried to make themselves useful about the house. 我的侄子都想帮我收拾收拾房子.