fulcrum
noun- (
physics 物理 the point on which a lever turns or is supported （杠杆的）支点，支轴 - [usually singular]
the most important part of an activity or a situation （活动、情况的）最重要部分，支柱 the fulcrum of the whole debate 整个辩论的支点 There was a fulcrum point when the arguments tipped decidedly in one direction. 当争论明显向一个方向倾斜时，就有了一个支点。
Word Originlate 17th cent. (originally in the general sense ‘a prop or support’): from Latin, literally ‘post of a couch’, from fulcire ‘to prop up’.