• 1. 首先其次: for one thing for another
• 2. 首先其次然后: First and Second and then

• 1.它让你首先看别人怎样对待你，其次看你怎样对待别人。
  It makes you look firstly at how you're treated and secondly how you treat everybody else.
  dict.yoduao.com
• 2.该计划现在比预定的计划晚了7年，首先是因为费用增加，其次是由于技术问题。
  The programme is now seven years behind schedule as a result, firstly of increased costs, then of technical problems.
  dict.yoduao.com
• 3.她做那件事，首先是因为她自己想做，其次是因为我要她做。
  She did it first because she wanted to, and second because I asked her to.
  dict.yoduao.com

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