low-emission source
... low-emission低污染的 low-emission source低污染源 low-emission technology低污染技术 ...
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就算污染源企业拿到了免费的许可，他们也有降低污染，把多余的许可卖给别人的激励。
Even when polluters get free permits, they still have an incentive to reduce their emissions, so that they can sell their excess permits to someone else.
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