Whether the content of Zhihu is within the scope of duplicate checking depends on the specific duplicate checking software and settings. Generally speaking, Zhihu's content may be regarded as an Internet resource by some duplicate checking software and incorporated into the Internet resource pool. Therefore, under some settings of some duplicate checking software, the content on Zhihu may be detected. However, different duplicate checking software may handle this differently, so you need to refer to the specific duplicate checking software and settings for specific situations.