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tokens: This work was supported by the Chinese NSF through grants NSF 11673066, NSF 11673051, and NSF 11873019. B.Z. and Y.W.W. are supported by the 100 Talents Project of the Chinese Academy of Sciences (CAS). K. L. J. Rygl acknowledges financial support by the Italian Ministero dell’Istruzione Università e Ricerca through the grant Progetti Premiali 2012-iALMA (CUP C52I13000140001). Y.W.W. is supported in part by the West Light Foundation of the Chinese Academy of Sciences (XAB2016A06). Facility: VLBA.