invaluable 

  1. 形容詞
無價的
非常貴重的, 非常寶貴的
無法估價的, 價值無法衡量的
invaluable to/for ...(人事物):
對...來說是無價的
對...而言價值無法衡量的
對...起了無法估量的作用的
invaluable for ...(動詞ing ...):
對做...很有用的
invaluable in ...(事物):

    同義字詞
inestimable,priceless

例句

  1. Having a mentor to lead the way is invaluable .
  2. I think you are providing an invaluable service.
  3. They are practicable, applicable and invaluable .
  4. To the crew, this is invaluable , and they love it.
  5. To Military Men end Travelers they are invaluable .