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tokens: L.S. is indebted to Jiang-Tao Li for the valuable advice and thanks Ning-Xiao Zhang for the technical help. This work is supported by the 973 Program under grants 2017YFA0402600 and 2015CB857100 and the NSFC under grants 11773014, 11633007, and 11851305. Facility: Chandra (ACIS-S). Software: CIAO (Fruscione et al. 2006 ), WVT binning (Cappellari Copin 2003 ; Diehl Statler 2006 ), Xspec (Arnaud 1996 ), SPEX (Kaastra et al. 1996 ), DS9. 12 12 http://ds9.si.edu/site/Home.html