Meaning of zuò yòng:
作用
to act on; to affect
Zhè yào duì tā de bìng yǒu hěn hǎo de zuòyòng.
这药对他的病有很好的作用。
This medicine has a very good effect on his illness.
action; function; activity; impact; result; effect; purpose; intent
Yào wù zài zhì liáo zhōng de zhòng yào zuò yòng bù néng hū shì.
药物在治疗中的重要作用不能忽视。
The important role of medication in treatment cannot be ignored.
Zhè yào de zuòyòng hěn dà.
这药的作用很大。
The effect of this medicine is significant.
Zhè gè yào de zhǔyào zuòyòng shì shénme?
这个药的主要作用是什么?
What is the main purpose of this medicine?
(suffix) -ation, -tion etc, as in 抑制作用[yi4 zhi4 zuo4 yong4], inhibition
Zhè zhǒng yàowù duì jíbìng yǒu hěn hǎo de zhìliáo zuòyòng.
这种药物对疾病有很好的治疗作用。
This medicine has a very good therapeutic effect on the disease.