Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
蕨类植物是最
的维管植物，至今仍然是
态系统初级产力的重要
分。
的Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.
蕨类植物是最的维管植物，至今仍然是态系统初级产力的重要分。
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