Chapter 4 Cosmic-Ray Physics *Supported by the National Key R&D Program of China (2018YFA0404203), the International Scholarship Program of the MOST of China (G2021166002L), National Natural Science Foundation of China (NSFC) (12147208, U2031103, U1931204) and the Science and Technology Department of Sichuan Province (2021YFSY0031). (1st March 2022)