“有用”造句
生意场上，不动声色会非常
有用。
In business a poker face can be very useful.
有很多特效的时候，高清电视就格外
有用了。
HDTV is especially useful if there are a lot of special effects.
小剂量的止痛药对于降低体温非常
有用。
Pain-killers are very useful in small amounts to bring your temperature down.