每年秋季，成千上万只帝王蝶就飞行3,000多公里到达墨西哥境内的山脉过冬。

Each autumn, thousands travel up to 3,000km to spend winter in the mountains of Mexico.

youdao

每年秋季，成千上万只帝王蝶就飞行3,000多公里到达墨西哥境内的山脉过冬。

Each autumn, thousands travel up to 3,000km to spend winter in the mountains of Mexico.

youdao