• 1. be sure: 确定
• 2. be sure to: 一定 | 务必 | 一定要 | 必定
• 3. be sure of oneself: 有自信心 | 自信 | 有一种力量叫自信

更多释义

• 1.He might get there in time, but I can't be sure.
  他有可能准时到达，但我不敢肯定。
  dict.yoduao.com
• 2.England must win this game to be sure of qualifying.
  英格兰队必须拿下这场比赛才能确保获得资格。
  dict.yoduao.com
• 3.He is intelligent, to be sure, but he's also very lazy.
  他固然聪明，但也很懒。
  dict.yoduao.com

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