Li-Fan Chen says to YSITD https://www.facebook.com/notes/%E6%88%91%E6%98%AF%E5%8F%B0%E7%81%A3%E4%BA%BA%E5%8F%B0%E7%81%A3%E6%98%AF%E5%92%B1%E7%9A%84%E5%9C%8B%E5%AE%B6/%E9%A6%AC%E8%8B%B1%E4%B9%9D%E9%80%99%E4%B8%8D%E5%8F%AB%E8%B2%AA%E6%B1%A1%E4%BB%80%E9%BA%BC%E5%8F%AB%E8%B2%AA%E6%B1%A1/601654386523656/