Correct

原动力

/ yuándònglì / 
Strokes

Definition

motive force/prime mover/first cause/agent

Example

As a Noun

motive power; motility; prime power

1
Yīqiè
一切
rénlèi
人类
huódòng
活动
de
的
yuándònglì
原动力

prime mover of all human activity