Thanks for updating. Sorry for the confusing screenshot. The error message says that "There are some problems in your translation" without pin point any specific problem.
Yes, my edit version is modified from initial machine translated content, but I rephrase each sentence and word on my own. So I'm positive that the change rate is at least 30%.
Actually, the second issue I mentioned above was automatically resolved itself after a day.

Update same issue happens again on different topic. Attached a screenshot{F31697223}

Update, submission succeed after retry today with same content. The root cause is still unclear.
Please refer link https://zh.wikipedia.org/wiki/%E5%90%89%E5%A7%86_(%E9%A9%AC%E5%90%8D)