基于各种努力，与2000年相比，北京市空气中的硫化物含量减少了近一半，工业烟尘排放量则减少了三份之二。

Because of that and other changes, Beijing’s sulfur emissions have been cut almost in half compared with 2000, and industrial dust has decreased by two-thirds.

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此类密封胶系列用空气中的水分进行硫化。

Sealant such series of the water used for air curing.

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海绵状橡胶，制造过程中在硫化前加入了空气气泡。

Spongy rubber; made by introducing air bubbles before vulcanization.

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