@Charmingwind, @anbit: Yes, sorry — there's a bug rendering some Chinese characters in the PDF library we use under iOS 18. We've reported it and are waiting for a fix.
@dstillman,thx so much and may I Know when this bug could be fixed? Because I urgently need to read literature on my iPad, I hope this bug can be fixed as soon as possible so that I can use it normally.
If you only need to read something, you can switch to reading mode which doesn't seem to be missing characters: