1.  uncertainty
2.  not sure

• 1. 不确信: be uncertain about | uncertainty | Uncertainties
• 2. 不确信的: un certain
• 3. 他们也不确信: They also are not sure | They do not believe

更多释义

• 1.消费者们似乎不确信经济萧条已经过去了。
  Consumers seem unconvinced that the recession is over.
  dict.yoduao.com
• 2.“能再说一遍吗？”凯特说道，不确信自己有没有听对。
  "Excuse me?" Kate said, not sure she'd heard correctly.
  dict.yoduao.com
• 3.但本周他又说他已经不确信了。
  This week he said he is no longer sure.
  dict.yoduao.com

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