• 1. be proficient in: 精通 | 熟练的 | 完全掌握
• 2. Be proficient in something: 在某方面非常擅长
• 3. Be proficient in system maintenance: 熟悉系统软硬件

• 1.The only way that one is going to be proficient in it is to invest significant time.
  想要获益的唯一办法便是投入大量时间。
  dict.yoduao.com
• 2.NCLB mandated that 100 percent of students be proficient in reading and math by 2014.
  NCLB法案要求到2014年时100%的学生在阅读和数学方面必须达到优秀。
  dict.yoduao.com
• 3.Sure, physicists have to be proficient in mathematics, but the main thing is to have that curiosity and drive.
  当然,要精通数学,但最主要的是具备那样的好奇心和动机.
  dict.yoduao.com

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