Meaning of jiān xìn:
to believe firmly; without any doubt
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Wǒmen jiānxìn tā huì chénggōng.
我们坚信他会成功。
We firmly believe that he will succeed.
Wǒ jiānxìn wǒmen huì chénggōng.
我坚信我们会成功。
I firmly believe that we will succeed.
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