2 causing someone to take action -- 促使(某人)採取行動的
Local parents were the moving force/spirit behind the safety improvements at the playground (= they were the people who made them happen). 當地的家長是使操場安全標準得以提高的原動力。
3 the action of going to a different place to live or work -- 搬家;變換工作地點
I hate moving. 我討厭搬家。