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tokens: ACKNOWLEDGEMENTS The authors thanks an anonymous referee for comments that improved the contents of this Letter. TS thanks T. H. Saitoh and R. Maiolino for useful discussion. TS and the other authors thank the ALMA staff for their kind support. NL acknowledges support by National Key RD Program of China #2017YFA0402704 and NSFC #11673028. This Letter makes use of the following ALMA data: ADS/JAO.ALMA#2015.1.00003.S. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), 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.