He dedicated most of his time to charity work.

He dedicated most of his time to charity work.
    他大部分時間都致力于慈善工作。
    dedicate表示把時間或精力等用在...，用在哪方面就用介詞to。 dedicate的名詞是 dedication,表示對某事的熱誠和獻身。
    例：
    Her dedication to education.她對教育的熱誠付出。
    He dedicated his life to science.他獻身于科學。