CGC invited Prof. Jia-Jun Zhang from Shanghai Astronomical Observatory, Chinese Academy of Sciences （SHAO, CAS）to visit Yangzhou University on Dec 22, 2021. Prof. Jia-Jun Zhang obtained his Ph.D. from Chinese University of Hong Kong in 2017. He was the postdoc researcher in Shanghai Jiaotong University from 2017 to 2019, and in IBS Center for Theoretical Physics of the Universe from 2019 to 2021. He came back to join SHAO in 2021. During his visit he delivered a public lecture named “Chinese Astronomical Facilities of Today and Tomorrow” and an academic seminar titled "21cm Intensity Mapping with BINGO".