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1·I believe in you because you are the most excellent in our class.

我相信你，因为你是我们班最优秀的。

2·If you don't believe in yourself, nobody will.

如果你自己都不相信自己，那就没有人会相信你了。

3·You have to believe in yourself.

你必须相信你自己。

4·You have to believe in yourself.

你必须相信你自己。

5·I believe in you.

我相信你。

6·I don't believe in happiness. I believe in you.

我不相信幸福，我相信你。

7·The people are sure to believe in you if you govern the country by morals and laws.

如果你用道德和法律治理国家，人民一定会信任你。

8·If you believe in yourself you can succeed.

对自己有信心，你就能成功。《柯林斯英汉双解大词典》

9·As long as you believe in yourself and keep trying, you will succeed.

只要你相信自己，不断努力，就会取得成功。

10·If you believe in yourself, you can succeed.

只要自信，就能成功。