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tokens: This work is supported by the National Natural Science Foundation of China through grants of 11503035, 11573036, 11373009, 11433008, and 11403040, the China Ministry of Science and Technology under State Key Development Program for Basic Research through the grant of 2012CB821800, the International ST Cooperation Program of China through the grant of 2010DFA02710, the Beijing Natural Science Foundation through the grant of 1144015, and the Young Researcher Grant of National Astronomical Observatories, Chinese Academy of Sciences. K.W. acknowledges support from the ESO fellowship and grant WA3628-1/1 through the DFG priority programme 1573 “Physics of the Interstellar Medium” ( http://www.ism-spp.de ). We give our thanks to the staff at the Qinghai Station of Purple Mountain Observatory for their hospitable assistance during the observations and the Key Laboratory for Radio Astronomy of Chinese Academy of Sciences for partial support in the operation of the telescope.