雾变成霜预示着冬季的到来。
中国北方城市经常被雾霾所笼罩，尤其是在寒冷的冬季，家庭和发电厂都是靠烧煤来取暖。
Northern China is often cloaked in smog, especially during the cold winter months when homes and power plants burn coal to keep warm.
冬季是温带，秋季和春季阳光充足和提供明确的天，夏季提供雾清晨和阳光，凉风习习的下午。
The winter months are temperate, fall and spring offer sunny and clear days, and the summers provide foggy early mornings and sunny, breezy afternoons.
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