1、Each sorus contains several sporangia, each of which produces numerous spores.(每个孢子团包含几个孢子囊,每个孢子囊产生大量的孢子。)
2、The sporangia of ferns are usually found on the undersides of their leaves.(蕨类植物的孢子囊通常生长在叶子的下表面。)
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