单词：control arm
control arm的用法和样例：
例句
- They consist of two switches and a control rod with two moveable collars.它们包括两个开关和一个带两个活动轴环的操纵杆。
- Studies also show that just like chimpanzees, pigs can also control the joystick in front of a computer screen.他们在一系列的研究中还发现，猪能够像黑猩猩一样操作计算机屏幕前的操纵杆。
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