A spiral deformation occured in the lower part of the young leaf enclosed in the sheath.
在叶鞘裹住的幼叶下部呈现螺旋状。
The spiral protective sheath for the rubber tube with good elasticity is more in favor of being installed outside an oil pipe, and has longer service life.
月牙结构，相对传统的 特别加厚和直板技术，也更加富有弹性。弹性好的胶管螺旋保护套更有利于安 装在油管外面，且寿命更长。
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