beneficial/ˌbenɪ'fɪ∫əl/

a. having a helpful and good effect

a. 有益的，有利的：[beneficial to sb/sth] Swimming is beneficial to health. 游泳有益健康。

构词bene （好） + fic + -ial

音组-ficial/-'fɪ∫əl/

artificial; beneficial; official