When autumn arrives in the United States and Canada, you can see one of nature's greatest scenes—the yearly migration of the monarch butterflies.

在美国和加拿大的秋天到来时，你可以看到大自然最壮观的景象之一——帝王蝶一年一度的迁徙。

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At last, the yellow leaves falling down from the trees means the autumn arrives.

最后，从树上降下的黄叶，便一味着秋天的到去。

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But when autumn arrives, the wind and rain will ruthlessly expose the gaps and cracks.

但等秋天一到，凄风苦雨会把破败不堪的真容暴露无遗。

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