Chinese here, to be honest, I don’t think there are communities with an atmosphere like hn and reddit in China, including v2ex.com, zhihu.com mentioned in other replies.
I like hn, and many subreddits, but at the same time I also have language problems, So I created https://www.buzzing.cc , which collected many popular discussions in English communities, then translate all titles in Chinese and Japanese, approximately 3000 users visit per day.