outer spindle

例句：

1. 1. The outer spindle is the part of the wooden structure that supports the weight of the roof.
   外心轴是木结构中支撑屋顶重量的部分。
2. 2.The outer spindle is responsible for transmitting power from the motor to the wheels.
   外心轴负责将电机的动力传递给车轮。
3. 3.The outer spindle is a crucial component of the bicycle frame, providing stability and support.
   外心轴是自行车框架的关键部件，提供稳定性和支持。