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每年,帝王蝶要在加拿大和墨西哥之间迂徙3000-4000千米。对弱小的昆虫来说这是一次惊人的旅行,因为它只有0.5克重。
Each year, monarch butterflies migrate between 3000-4000 km between Canada and Mexico. This is an amazing trip for small and weak insects because it only weighs 0.5 grams.