hypocotyl [ˌhaɪpə'kɒtəl]

例句:

• Cytyledons and future stalk called the hypocotyl elongate.
  子叶和未来称为下胚轴的主轴延长.
  
• At the onset of germination, the hypocotyl elongates rapidly by cell enlargement.
  萌发开始时, 下胚轴依靠细胞增大而迅速伸长.
  
• As the development of the hypocotyl continues, the characteristic crook in the upper portion becomes apparent.
  由于下胚轴继续发音, 上部特有的弯曲变得明显.