1.  certain
2.  doubtless
3.  questionless
4.  incontrovertible
5.  indubitable

• 1. 无疑的: out of question | certain | undoubted | doubtless
• 2. 无疑的事实: a positive fact
• 3. 确实的、无疑的: certain

更多释义

• 1.有一点是确定无疑的，即两人对彼此都非常敬重。
  One thing is certain, both have the utmost respect for each other.
  dict.yoduao.com
• 2.确定无疑的是，布莱克先生会支持你的计划。
  It is certain that Mr. Black will support your plan.
  dict.yoduao.com
• 3.一定程度的气候变暖是确定无疑的，但其程度将由冰的融化、海洋、水蒸气、云和植物的变化等循环过程所决定。
  Some warming is certain, but the degree will be determined by cycles involving melting ice, the oceans, water vapour, clouds and changes to vegetation and plants.
  dict.yoduao.com

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