overachiever

noun
🔊/ˌəʊvərəˈtʃiːvə(r)/
🔊/ˌəʊvərəˈtʃiːvər/
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  1. a person who does better than expected in their studies or work 学习(或工作)得比预期好;取得比预期好的成绩
  2. a person who tries too hard to be successful in their work过于努力;过于进取Topics Successc2