1. 形容詞
   有用的, 有益的
   有幫助的, 有用處的
   值得高度讚揚的
   useful to ...(人)/
   useful for ...(事物):
   對...有用的
   對...有益的
   對...有幫助的
   useful for ...(動詞ing ...):
   對做...有用的
   

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   同義字詞
   actionable,applicable,applicative,applied,functional,practicable,practical,serviceable,ultrapractical,usable,useable,workable,working
   available,employable,exploitable,fit,functional,operable,practicable,serviceable,usable,useable
   conducive,facilitative,helpful
   

例句

1. This is a very useful answer!
2. Animal models could also be useful .
3. The useful from the not worth knowing?
4. They're very useful pieces of documentation.
5. Impact Analysis is another useful tool here.
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