tokens: We thank the anonymous referee for carefully reading our manuscript and providing many thoughtful comments that greatly improved the quality of this paper. A.I. acknowledges support from the NSF grant No. AST-1535809. A.I., S.L., and H.L. acknowledge the support from Center for Space and Earth Sciences at LANL, and H.L. acknowledges the support from LANL/LDRD program. S.J. acknowledges support from the National Natural Science Foundation of China (grant No. 11503092). This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00601.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Facility: ALMA . Software: LA-COMPASS (Li et al. 2005 , 2009 ; Fu et al. 2014 ), RADMC-3D (Dullemond 2012 ), radmc3dPy ( http://www.ast.cam.ac.uk/juhasz/radmc3dPyDoc/index.html ).
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