useful
adjective uk/ˈjuːs.fəl/ us/ˈjuːs.fəl/
A2 有用的，有效的；有帮助的
effective; helping you to do or achieve something
A good knife is probably one of the most useful things you can have in a kitchen. 一把好刀应该是厨房里最有用的物件之一。
Do the exercises serve any useful purpose? 这些练习有什么用处吗？
- More examples
- It would be useful to have a secretary to deal with all the paperwork.
- A laptop would be really useful for when I'm working on the train.
- This booklet provides useful information about local services.
- These small village shops serve a very useful purpose.
- Many employers consider hands-on experience to be as useful as academic qualifications.
Idioms
come in usefulidiom UKC2 派上用场，有帮助
to be useful and help someone to do or achieve something
You should keep that paint - it might come in useful one day. 你应该留着那些油漆——说不定哪天会派上用场。
make yourself usefulidiom 别闲着
a way of telling someone to start being helpful
Now you're here, you might as well make yourself useful - there's a lot of cleaning up to do. 既然你来了，那就别闲着——有很多清理工作要做。