根毛是由特异表皮细胞形成的管状突起，其发生发育经历三个阶段：细胞命运决定，根毛起始和尖端生长。
Root hairs are long tubular outgrowths that form on the surface of specialized epidermal cells. Their development occurs in three phases: cell fate specification, initiation and subsequent tip growth.
随着生长，翼状韧带(附着于齿状突尖端和枕部的韧带)向上牵拉小骨形成其特征性的表现。
With growth, the alar ligaments that attach the tip of the dens to the occiput pull the ossicle upwards giving it its characteristic appearance.
在枝晶生长过程中枝晶尖端的浓度和温度的梯度最大；
The solute and temperature gradients in the tip are the highest.
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