1.  unqualified
2.  incompetent
3.  underproof
4.  off specification

• 1. 不合格的: unqualified | Defective | Ineligible
• 2. 不合格的螺纹: bastard thread | bastard connection
• 3. 有一扣不合格的接头: bastard connection

更多释义

• 1.交通警察经考核不合格的，不得上岗执行职务。
  Any traffic policeman who is assessed to be unqualified shall not be on post to perform his duties.
  dict.yoduao.com
• 2.不合格的大学毕业生是一个严重的问题。
  Unqualified college graduates are a serious problem.
  dict.yoduao.com
• 3.即使服务是不合格的，也要记得给一些小费。
  Even if service is substandard still leave at least some tip.
  dict.yoduao.com

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