英汉词典

1. 有用的；可用的；有助益的
    If something is useful, you can use it to do something or to help you in some way.

    e.g. The slow cooker is very useful for people who go out all day...
           慢炖锅对于整天都不在家的人来说很有用。
    e.g. Hypnotherapy can be useful in helping you give up smoking...
           催眠疗法可能有助于你戒烟。