Da Wei, a professor and director of the Center for International Security and Strategy at Tsinghua University, led a group of Tsinghua students on a study tour in the US from July 26 to August 9. For many, this was their first time visiting the US. We spoke to Da and two students about this experience, and their thoughts on China-US relations. (Produced by Wang Zi, Li Bowen, Di Jingyuan and He Jiahao, intern Song Yanyan and Wang Ruxin)