• 1. In the first class: 在第一节课
• 2. in the First Class Lounge: 在头等舱
• 3. stand first in the class: 在班上名列第一

• 1.They did just open, though, so I don't think I feel comfortable having our son in the first class of a brand-new school.
  不过他们刚成立，所以我不太放心让我们的儿子成为一所全新学校的第一批学生。
  dict.yoduao.com
• 2.He sat quietly in the first class cabin of the flight looking tired.
  他静静地坐在班机的头等舱内，看上去有些疲惫。
  dict.yoduao.com
• 3.In the first class, I briefly Shared my own cancer recovery story.
  第一课，我简要地介绍了自己从癌症康复的经历。
  dict.yoduao.com

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