冯元宁和林正燮参加了组会并参观了实验室，冯元宁以前的师妹王祺娴带我们了解了课题组情况。我们感谢与美国马萨诸塞州剑桥市麻省理工学院的蒂莫西·斯瓦格教授及其课题组成员的友好交流和富有成效的讨论。Yuanning Feng and Aaron Lim attended their group meeting and visited the laboratory. Yuanning's former peer mentee, Chi-Hsien Wang introduced us to the group. We appreciate the kindness and fruitful discussion with Professor Timothy Swager and his group members at the Massachusetts Institute of Technology, Cambridge, Massachusetts, United States.