1. gainful

    /ˈɡeɪnfl/ adj.有利益的,唯利是图的
  2. gainfully

    /ˈɡeɪnfəli/ adv.有利益地,有收入地
  3. gainfulness

    /gainfulnɪs/ n. 收益;唯利是图的;有利益的;
  4. painful

    /ˈpeɪnf(ə)l/ adj. 疼痛的;痛苦的;令人不快的
  5. painfully

    /ˈpeɪnfəli/ adv. 痛苦地,费力地
  6. painfulness

    /ˈpeɪnfəlnəs/ n.痛苦