• 1. make certain of: 把…了解清楚
• 2. make certain of sth: 确保做某事 | 弄清楚

• 1.You'll have to leave soon to make certain of getting there on time.
  你得快点出发，好确保准时到达那里。
  dict.yoduao.com
• 2.Dany took a moment to make certain of her directions.
  丹妮花了点时间确认了一下她前进的方向。
  dict.yoduao.com
• 3.You'd better leave now if you want to make certain of getting there on time.
  你要想准时到达那里就最好马上走。
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