useless objects have no purpose or cannot do what they were designed to do 无用的；无效的 | This technology is useless if you aren’ t trained to operate it. 如果你没有经过操作培训，这项技术就没有用。 |
| Why do you keep this completely useless umbrella? 你为什么还留着这把毫无用处的雨伞呢？ |
| prove useless Most of his inventions proved useless. 他的大多数发明证明并无用处。 |
| | a | useless activities are not effective in achieving the purpose they were intended to achieve （活动）未达到目的的，没有成效的 | | Will’ s parents think acting is a useless profession. 威尔的父母认为表演是个一无是处的职业。 | | it’ s useless trying to do sth It’ s useless trying to talk to her because she never listens. 想跟她说话是白费口舌，因为她从来就不听。b. | |
| | b | if someone is useless , they are not any help to you or are not capable of achieving anything （某人）帮不上忙的，做不成事的，无能的 | | Don’ t ask Geoff – he’ s useless! 不要问杰夫，他帮不了忙！ | | useless at sth (=very bad at it) I’ m useless at cooking. 做某事非常差劲的 | |
| | c | a part of your body or mind that is useless cannot be used because of an illness or injury （身体一部分或心智因有病或受到损害而）丧失功能的 | | Since the stroke, my left arm has been useless. 中风以来，我的左臂已经丧失了功能。 | |