When Billy was moved to a more advanced class,he had to work hard to keep pace.

 
  • 当比利转到高级班时,他不得不努力学习才能跟上其他学生。
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  • 深远海浮式风电平台 - deep-sea floating wind power platform
  • 京雄高速公路 - Beijing-Xiongan expressway
  • 农业及相关产业增加值 - the added value of agriculture and related industries
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