• 1. 打保票: vouch for somebody | guarantee something

• 1.关于此后的时期，尽管我会接受一些意见，但我不敢打保票。
  With regard to the subsequent periods, though I may entertain some hopes, I dare not presume to give any assurances.
  dict.yoduao.com
• 2.但是Bedau教授说没有人对制造新型生命的后果打保票。
  But Professor Bedau says that nobody can be sure about the results of making new forms of life.
  dict.yoduao.com
• 3.我认为我们的研究是对头的，但在明年的结果出来以前，我们不能打保票。
  I think we are on the right track in our research. But we can't be sure until results start coming in next year.
  dict.yoduao.com

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