在大城市里，在寒冷的冬季，许多老年人因呼吸污染的空气而死去。

In big cities during cold winter months, many old people die from the polluted air.

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对年轻人来说，特别是在大城市里，狗已经变成必备的流行配件，而老年人则求助于小狗带来的友谊。

For young people, especially in the larger cities, dogs have become a must-have fashion accessory, while older people are turning to dogs for companionship.

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