I can't add chinese font into a pdf

Use a proper translation tool, like SDL Trados. Acrobat is not a word processing application, and definitely not a translation application.

Thanks Aandi andTry67 , I didn't say clearly, I can do the translation by myself, I just can't type in the Chinese characters into the Text area, which I can use touchup text tool to select and modify, but It seems difficult to type in Chinese character, because I have to use properties to change font in every other words! So it's impossible for me to type.

You don't understand our thrust. PDF files are really not meant for
editing! Only the most minor of changes can be made and even if you can
change a single letter, you cannot expect the text on the page to follow
its previous course. It might, but all to often it will not. I have
seen changing one letter ruin several lines of text! It is always,
always, ALWAYS better to create the document anew rather than try any
serious editing. Even with minor editing it is better to recreate the
document if possible.

Mike

> I just can't type in the Chinese characters into the Text area,

Exactly. That's what I thought. I very strongly advise you: PDF is not
suitable, give up on the idea of translating a PDF while keeping it a
PDF. I repeat my advice: remake the document.

Aandi Inston