如果我们把二氧化硫释放到大气中去，而大气中已经有云雾颗粒存在，那么已有的云雾颗粒就会粘住这些二氧化硫微粒，使它们变大，而不是自己形成新的微粒。

If you put sulphur dioxide into air that already has a haze of particles in it, the gas will glom onto those particles, making them bigger, rather than forming new small particles of its own.

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