He dedicated most of his time to charity work.

• 

  夏子华 (07/10/2008)

  He dedicated most of his time to charity work.
  
  他大部分时间都致力于慈善工作。
  
  ----------------------------------------------------------------------
  dedicate表示把时间或精力等用在...，用在哪方面就用介词to。 dedicate的名词是 dedication,表示对某事的热诚和献身。
  例：
  Her dedication to education.她对教育的热诚付出。
  He dedicated his life to science.他献身于科学。