翻译：David 超越了他的同班同学，只用两年半就拿到了本科学位。
David is leapfrogged to his classmates and get the bachelor degree just in only two and a half years.
参考翻译：David leapfrogged his classmates and obtained his bachelor's degree within just two and a half years.
作名词它的本意是“跳马游戏、跳山羊游戏”，动词本意就是跳山羊（分腿跳过）这个动作，也常常引申为“突然超越、窜至、一跃超过”。
Thanks to a happy combination of A and B, C may now be able to leapfrog ahead not once but twice, skipping both D and, often, E.”
not once but twice 不是一次而且两次
China is leapfrogging to the forefront of global innovation.中国一跃站到了世界创新的最前沿”。
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