The translation seems wrong in Chinese.
I feel that last sentence's translation in Chinese is wrong(不過如果你相信我,一切都可以變成真的。). but I am not sure. the paragraph is belew
It's a barnum and Bailey world,
Just as phony as it can be,
But it wouldn't be make-believe
If you believed in me.
"it's only a paper moon"
I have found the problem, thanks all.