upper control arm

例句：

1. 1. The engineer used the upper control arm to adjust the angle of the machine.
   工程师使用上部控制臂来调整机器的角度。
2. 2.During the assembly process, the upper control arm needs to be precisely aligned with the lower one.
   在装配过程中，上部控制臂需要与下部精确对齐。
3. 3.The upper control arm is crucial for maintaining the stability of the vehicle's suspension system.
   上部控制臂对于保持车辆悬挂系统的稳定至关重要。