Baidu knows that it is a divergent structure, and Zhihu Q&A is a convergent structure. Theoretically, anyone can see the problem you throw into Baidu, but you can't see it on Zhihu. If seeking an answer is sometimes like looking for a needle in a haystack, it is more likely to be found on Baidu Know than Zhihu Q&A.. But if your question is just right, you will gain more from Zhihu's question and answer than from Baidu's knowledge.