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tokens: We are grateful to J. Chen, J. Delabrouille, Z. Huang, J. Liu, X. Tong, L. Xue, D.-G. Wang, Z. Wang, and S.-Y. Zhou for valuable discussions. We also thank the anonymous referee for constructive comments. Y.F.C. and J.J. are supported in part by the NSFC (grants No. 11653002, 11722327, 11421303, J1310021), by the National Youth Thousand Talents Program of China, by the CAST Young Elite Scientists Sponsorship Program (2016QNRC001), and by the Fundamental Research Funds for the Central Universities. Q.Y.L. is supported in part by the Department of Physics Astronomy at the University of Pennsylvania. Y.Z. is supported in part by the NSFC (Nos. 11675165, 11633001), the CAS Strategic Priority Research Program “The Emergence of Cosmological Structures” (No. XDB09000000) and SRFDP. All numerical computations are operated on the computer clusters “ Linda Judy ” in the particle cosmology group at USTC.