well their pronunciation of R it's very bad compared to Japanese which can say it perfectly clear, not that English natives would set very high bar for Chinese

well their pronunciation of R it's very bad compared to Japanese which can say it perfectly clear, not that English natives would set very high bar for Chinese with R pronunciation, I come from Europe where you can pronounce very clearly and sharp in many languages, so if you can't it seem like you have problems with speaking and of course i am taking about Chinese Chinese, not american Chinese or CC exposed to English and other foreign languages since early childhood which can improve their R, but usually if you wanna distinguish Japanese and Chinese just ask them to pronounce R or even better RRRRR sound which it's completely impossible for Chinese