Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
物是最早登陆的维管物，至今仍然是生态系统初级生产力的重要
成部分。
Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
物是最早登陆的维管物，至今仍然是生态系统初级生产力的重要成部分。
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