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。
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。
It portrays a common natural phenomenon: when autumn arrives, leaves from trees will fall to the ground.
它描绘了一个非常普通的自然现象：秋天来临，落叶归根。
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