the cutting edge
noun [ S ] uk/ˌkʌt.ɪŋ ˈedʒ/ us/ˌkʌt̬.ɪŋ ˈedʒ/
发展前沿；领先位置；先锋地位
the most modern stage of development in a particular type of work or activity
a company at the cutting edge of mobile communications technology 在移动通讯技术方面处于领先地位的公司