N-SING. (某事物发展的)尖端，最前沿，领先阶段. If you are at the cutting edge of a particular field of activity, you are involved in its most important or most exciting developments.
※The world can only be grasped by action, not by contemplation, The hand is more important than the eye…The hand is the cutting edge of the mind.   Jacob Bronowski, writer of the former soviet Union——只有勇敢付诸于行动而不是瞻前顾后，才能掌握这个世界。手比眼睛更加重要……手是思想的利剑。   前苏联作家  布洛夫斯基 . J .

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