pectineal line

例句：

1. 1. The pectineal layer of the tree is very important for its growth.
   这棵树的石蜡层对其生长非常重要。
2. 2. The pectineal layer protects the plant from water loss.
   石蜡层保护植物免受水分流失。
3. 3. The pectineal layer plays a crucial role in the plant's defense against pests and diseases.
   石蜡层在植物抵御害虫和疾病中起着至关重要的作用。