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单语范例（未经PONS编辑处理）
In this way, the epicotyl pushes the plumule above the ground.
en.wikipedia.org Growth of the plumule does not occur until the cotyledons have grown above ground.
en.wikipedia.org Here the hypocotyl is a rudimentary axis between radicle and plumule.
en.wikipedia.org Unlike a feather, a single bit of down, called a plumule, is puffy in lots of different directions, so it traps air.
www.afr.com A structure called the coleoptile, essentially a part of the "cotyledon", protects the young stem and plumule as growth pushes them up through the soil.
en.wikipedia.org