HSK 4
作用
zuòyòng名（动）
to act on; to affect; action; function; activity; impact; result; effect; purpose; intent
运动对身体有很大作用。
Yùn dòng duì shēn tǐ yǒu hěn dà zuò yòng.
Exercise has a major effect on the body.
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Other HSK words sharing a character
Also free:
Appears across levels (4（6）) in the HSK 3.0 word list.