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1·You may feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful you did it.

你可能觉得所有的训练都是在浪费时间，但我百分之百地肯定，以后你会庆幸你做过这一切。

2·You may feel all the training a waste of time, but I'm a hundred percent sure later you'll be grateful for what you did.

你可能觉得所有的训练都是浪费时间，但是我百分之百确定你以后会感激你所做的一切。

3·Are you a hundred percent sure it's your neighbour?

你百分百肯定这是你的邻居？《柯林斯英汉双解大词典》

4·I'm a hundred percent certain.

我百分之百的肯定。

5·Is it a hundred percent cotton?

是百分之百纯棉吗？

6·I'm a hundred percent certain.

我百分之百肯定。

7·I am a hundred percent sure.

我百分之百确定。

8·Son: I'm a hundred percent certain.

儿子：我百分之百地肯定。

9·We agree with you a hundred percent.

我们百分之百同意你。

10·I'm not a hundred percent convinced myself.

我自己也不是百分之百全信。