• 1. be certain to do: 有把握做某事 | 一定会做某事
• 2. be certain to do sth: 一定做 | 一定会 | 肯定会发生某事 | 肯定会
• 3. be e certain to do: 确定做某事

• 1.Why do I believe in certain planets too far away to be observed directly through a telescope?
  为什么我会相信望远镜能观察到过于遥远的行星？
  dict.yoduao.com
• 2.When a person does a certain thing again and again, he'll be obliged to do it in the same way by some unseen force. Thus habit is formed.
  当一个人反复的做某件事时，他就会被某种看不见的力量驱使不得不以同样的方式再去做这件事，于是习惯就形成了。
  dict.yoduao.com
• 3.And contrary to popularbelief, a simple way to do that might be to close certain roads.
  然而与通常人们认为的相反，有种简单的方法只需关闭某些道路就可以了。
  dict.yoduao.com

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