"从动件运动规律" can be translated into English as "motion law of the follower".
In this context:
"从动件" (cóngdòngjiàn) refers to the "follower" in mechanical systems, which is the component that moves in response to the motion of another component (such as a cam).
"运动规律" (yùndòng guīlǜ) means "motion law" or "law of motion," describing how a particular component moves over time.
So, when combined, "从动件运动规律" accurately translates to "motion law of the follower."