由于牛羊不能在恶劣的气候条件下生存，每年冬天都要把它们带到南方去。
Since sheep and cattle can't survive harsh climates, they needed to be taken south every winter.
如果冬天不是很冷，它们的叶子可能会保持绿色。
If the winter is not very cold, their leaves may stay green.
它们通常很难觅食，所以一些动物会在冬天来临前收集额外的食物并储藏起来，例如老鼠。
It is often hard for them to find food, so some animals such as mice collect extra food before winter and hide it.
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