If a person laughs when seeing something fundamental, it means that he does not explore the problem deeply, cannot accept the truth, and can only float on the surface. It is like someone who glances at the textbook every day before going to bed and gets full marks on the test. This is a deep understanding, because the brain is almost omniscient and omnipotent about the problem to be solved now, and solving the so-called difficult problem is a piece of cake. This is like using a valley to hold water$ETH $BTC

or a cup. The secondary view is the small cup, and the lower view can only be a partial idea, and the truth is the valley.