根瘤的器官内有维管组织穿过。

The organ is penetrated with vascular tissue.

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维管植物的抗盐机理。

Salt resistance mechanism of vascular plants.

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自从泥盆纪以来就生存的低等维管植物。

Lower tracheophytes in existence since the devonian.

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自从泥盆纪以来就生存的低等维管植物。

Lower tracheophytes in existence since the devonian.

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