作用 (zuò yòng) means “to act on; to affect; action; function; activity; impact; result; effect; purpose; intent; (suffix) -ation, -tion etc, as in 用, inhibition”. It is an HSK 4 Chinese word in the HSK 3.0 vocabulary.
这有很大作用。
Zhè yǒu hěn dà zuòyòng.
This has a great impact.
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