Leapfrog is a game which children play, in which a child bends over, while others jump over their back.
例句
...children engaged in activities such as riding, playing leapfrog, or football.在玩騎馬、跳背和足球等的孩子們
VERB
（借勢）超越，趕超
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.
例句
It is already obvious that all four American systems have leapfrogged over the European versions...4個美國系統全部超過了歐洲版本，這已是顯見的事實。American researchers have now leapfrogged the Japanese and are going to produce a digital system within a year or two.美國研究人員現已乘日本人之東風趕超而上，將在一兩年內研制出一套數字系統。