Human beings can only know "knowledge", that is, "known" and "unknown", they cannot know "non-knowledge", let alone how much "knowledge" exists. A highly accomplished scientist, not only the "knowledge" he knows And there are far more "unknowns" in his mind than ordinary people, and he remains highly alert to "non-knowledge" at any time. Once the opportunity arises, he can break through the "known" restraint in his mind and do his best to move "Unknown" turns into "known". It can be launched accordingly (). ['"Unknown" conversion to known requires "unknown".', '"Known" in the mind can sometimes be a barrier for humans to recognize "non-knowledge".', 'Ordinary people cannot recognize and capture "unknown" and turn it into "known".', 'From the perspective of philosophy, there should be endless "unknowns".']