helical pitch

例句：

1. 1. The helical structure of the DNA molecule is crucial for its function.
   DNA分子的螺旋结构对其功能至关重要。
2. 2.The helical coils of the cable are designed to withstand high tension.
   电缆的螺旋线圈设计用来承受高张力。
3. 3.The helical path of the river winds through the forest.
   河流的螺旋路径穿过森林。