the central point, pin or column on which something turns or balances 支点;枢轴;中心点 the central or most important person or thing 最重要的人(或事物);中心;核心
Word Originlate Middle English: from French, probably from the root of dialect pue ‘tooth of a comb’ and Spanish pu(y)a ‘point’. The verb dates from the mid 19th cent.