prime mover
noun [ C usually singular ] uk/ˌpraɪm ˈmuː.vər/ us/ˌpraɪm ˈmuː.vɚ/
发起者；推动者
someone who has a lot of influence in starting something important
He was a prime mover in developing a new style of customer-friendly bookshops in the UK. 他对英国新式顾客友好型书店的发展起了很大的推动作用。