Acknowledgment

This work was supported by the National Key R$\&$D Program of China (Grant Nos. 2017YFA0402600, and 2016YFA0400702), the National Natural Science Foundation of China (Grant Nos. 11690024, 11725313, 11590783, and 11803051), the International Partnership Program of Chinese Academy of Sciences (Grant No. 114A11KYSB20160008), the CAS “Light of West China” Program, and the Young Researcher Grant of National Astronomical Observatories, Chinese Academy of Sciences. The author would like to thank helpful discussion with Michael G. Jones.

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