Now many people have air-conditioners and cars, they produce (give off) waste gas.

现在许多人有空调和汽车，他们生产废气(释放)。

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If (it is) burnt, rubber can give off a poisonous gas.

橡胶如果燃烧起来，会发出有毒气体。

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If (it is) burnt, rubber can give off a poisonous gas.

橡胶如果燃烧起来，会发出有毒气体。

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