...机的AB两端设计了两个可改变角度的折射镜，当转动镜头的对焦环（即改变镜头的聚焦点）时，这种运动量会通过测距臂（feeler arm）传到测距器上，并带动AB两端的折射镜转动。
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Be sure nothing interferes with the sweep of the feeler arm.
确保探测臂摆动时无阻碍。
The lower end of the feeler arm is a probe structure and arranged in the spring.
探测杆的下端为探针构造并置入弹簧之中。
The probe can be penetrated into a coating until the bottom part of the coating through the compressive force effect of the feeler arm.
探测杆在压力作用下促使探针刺入涂层直至涂层的底部。
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