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教材第八册中,《有趣的生物共栖现象》介绍了自然界的一种有趣现象———共栖。本期刊出一篇科普文章,介绍动物迁徙的故事与奥秘。
The eighth book, “interesting biological cohabitation phenomenon” introduced an interesting phenomenon in nature --- cohabitation. This issue of a popular science article, introducing the story and mystery of animal migration.