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tokens: The authors thank the anonymous referee for useful suggestions. W.P.L. acknowledges support from the National Key Program for Science and Technology Research and Development (2017YFB0203300). W.P.L. and X.K. acknowledge support by the NSFC projects (No. 11473053, 11233005, U1331201, 11333008) and the National Key Basic Research Program of China (No. 2015CB857001, 2013CB834900). X.K. is also supported by the foundation for Distinguished Young Scholars of Jiangsu Province (No. BK20140050). The simulations were run in the Shanghai Supercomputer Center and the data analysis was performed on the supercomputing platform of Shanghai Astronomical Observatory. W.C. is supported by the Ministerio de Economía y Competitividad and the Fondo Europeo de Desarrollo Regional (MINECO/FEDER, UE) in Spain through grant AYA2015-63810-P, as well as the Consolider-Ingenio 2010 Programme of the Spanish Ministerio de Ciencia e Innovación (MICINN) under grant MultiDark CSD2009-00064.