教训1：
学校A，几次电话往来以后，决定某星期一campus visit。我没有push。
然后2个星期没有消息(such as flight information)，campus visit前几天，我写电
子邮件告诉他们，我想3月份campus visit。The excuse is I need to focus on my
dissertation proposal defense on Feb 19th.
然后他们说：We have decided to re-open the position and restart the search
process. You are still in the applicant pool. We will keep you updated.
教训2：
学校B，开学以后马上和我联系，商量日期campus visit。他们给我一个日子，我不乐
意，告诉他们其他日期可不可以。I want to start visiting schools in late
Febuary. They wanted me to visit in the ear
