A2 effective; helping you to do or achieve something有用的,有效的;有帮助的
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.
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