1.  first kind
2.  first species

• 1. 第一类: primary sources | first class | first kind | first species
• 2. 第一类错误: type I error | error of the first kind
• 3. 第一类误差: type I error | error of the first kind

更多释义

• 1.请给我拿三张第一类邮件的邮票。
  Could I have three first-class stamps, please?
  dict.yoduao.com
• 2.邮局已承诺在星期五恢复该地区第一类邮件的递送。
  The post office has promised to resume first class mail delivery to the area on Friday.
  dict.yoduao.com
• 3.第一类朋友只是泛泛之交。
  The first type of friend is just an acquaintance.
  dict.yoduao.com

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