David 超越了他的同班同学，只用两年半就拿到了本科学位。
David leapfrogged his classmates and abtained a bachelor's degree only in 2.5 years.
（参考翻译：David leapfrogged his classmates and obtained his bachelor's degree within just two and a half years.）
场景:仅几年的时间，她就从初级钢琴学习者成长为高级学习者了。
造句:Within only a couple of years, she leapfrogged from a junior piano learner into a senior one.
