gainfuladj.
英 'geɪnfʊl; -f(ə)l | 美 'ɡenfl
中文adj. 唯利是图的；有利益的；赚钱的
词根词源
gainful (adj.)"producing profit or advantage," 1550s, from gain (n.) + -ful. Phrase gainfully employed attested from 1796. Related: Gainfully (1540s).
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