Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
蕨类植物是最早登陆的维管植物，至今仍然是
统初级产力的重要
成部
。
的Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
蕨类植物是最早登陆的维管植物，至今仍然是统初级产力的重要成部。
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