leap frog

柯林斯词典

1. N-UNCOUNT Leapfrog is a game which children play, in which a child bends over, while others jump over their back. 跳背游戏
The kids were playing leapfrog and doing somersaults in the backyard. 孩子们正在后院玩跳背游戏和翻筋头。
2. V-T/V-I If one group of people leapfrogs into a particular position or leapfrogs someone else, they use the achievements of another person or group in order to make advances of their own. (利用别人成就) 超越
It is already obvious that all four American systems have leapfrogged over the European versions. 显然，美国的全部4套系统已经超越了欧洲的版本。