Permits are transferable and may be bought or sold.

许可是可以转让的并且也可以买或是卖。

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Transferable emission permit — a pollution control policy requiring each emitter of a pollutant to possess permits for the amount of pollution it releases.

可转让许可系统——污染物控制政策要求每个污染排放源拥有污染排放许可。

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Emission permit system — a type of transferable permit system in which the permits are defined in terms of the right to emit a stipulated amount of emissions.

排放许可系统——转让许可系统的一种类型，这个许可确定了在权限方面可排放物总额排放的约定。

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