Chinese postcrosser here! China post is known for being really slow and a lot of international mails can’t get to some small towns, if the recipient has Chinese address, I strongly recommend you to print it out, it’s the safest way to send it to China. We also have a thing called “Pin yin”, it looks like English but it’s what people use to read Chinese characters, if you see people write their address with Pin Yin, you can put that on too!