useful造句
In business a poker face can be very
useful.
生意场上，不动声色会非常有用。
"For heaven's sake!" Dot expostulated. "They're cheap and they're
useful."
“拜托！”多特反驳道，“它们又便宜又管用。”
HDTV is especially
useful if there are a lot of special effects.
有很多特效的时候，高清电视就格外有用了。