New words：

emission [iˈmiʃ(ə)n] n.排放；辐射；排放物；

必记高频搭配

carbon emissions 碳排放

We must reduce carbon emissions to protect the earth.

harmful gas emissions 有害废气排放

Factories should control harmful gas emissions.

reduce / cut emissions 减少排放

More people choose buses to cut emissions.

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