About the rule

[1. The primary principle: English only! No Chinese! No other languages!]

If one put a pic that contains other language's content, but the explaination is pure English, does this violate this rule?

Uhhh, after your question I must admit, many laws do have loopholes to exploit. I think it depends on the intention of this netizen. If the intention of this netizen is only to share a picture, but this picture has information of other languages by coincidence, then he/her doesn't violate this rule. But if his/her intention is to exploit loopholes of our rule, then he/her violates this rule. Perhaps you can give us suggestions to distinguish the latter from the former?

回复 @圆环之理：An example is given in 5 Floor