How does the monarch butterfly travel thousands of kilometres on its yearly migration?
帝王蝶每年怎样进行不远千里地迁移?
The Monarch Butterfly breathes through its wings and female Monarchs have thicker wing veins.
帝王蝶通过翅膀呼吸，雌性帝王蝶有更加厚实的翅膀脉络。
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