• 1. No doubt about it: 勿庸置疑 | 不用怀疑它 | 不要怀疑它
• 2. There's no doubt about it: 那是毫无疑问的 | 没有任何怀疑 | 这毫无疑问

• 1.There seemed to be no doubt about it.
  此事似乎毫无疑问。
  dict.yoduao.com
• 2.He's made some great movies. There's no doubt about it.
  他拍了一些非常出色的影片。这一点是毫无疑问的。
  dict.yoduao.com
• 3.He says it's not easy to convince people that nutria fur is green, but he has no doubt about it.
  他说，让人们相信海狸鼠的毛是绿色的并不容易，但他对此毫不怀疑。
  dict.yoduao.com

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