For the 60 summer camp participants, who have travelled hundred or even thousand miles from home to come to City University of Hong Kong and spent 5 weeks here, mingled with some local students of Department of Electronic Engineering, to learn about mini robotic building and motion control programming as well as to feel the vibrancy of this international metropolis, where blends western and eastern cultures, the hardest thing is to say goodbye, no matter in which language, in its closing ceremony held on 31 July 2017.