I can't believe that this is true. （不敢相信事情是真的）
I can't accept that this is the true. （真相超出接受范围）
It is hard to believe that this is the true. （很难接受真相）
I can't believe this fact.
I can’t believe that it’s true.
我不敢相信这个事实
I can't believe the truth
《百度翻译》供你参考。
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