为控制害虫，人们持续且不计后果地使用人工合成化学品，对农作物和人类健康造成危害，事实证明会产生相反的效果。
The continuous and reckless use of synthetic chemicals for the control of pests which pose a threat to agricultural crops and human health is proving to be counter-productive.
这些法律同样会产生相反的效果，因为它们加大了有犯罪前科的人租房、就业的难度，而这两个因素正是避免他们重蹈覆辙的关键。
These laws are also counterproductive, since they make it harder for people with criminal records to find housing or land a job, two key factors that reduce backsliding.
超过此范围酒精可以产生相反的效果。
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