Thanks for your reply xiao man. I am a excellent student. Now I am a postgraduate of institute of particle physics Huazhong normal university. I am a "baosong yanjiusheng". Unfortunately, I cann't support myself at abroad. I am from Guizhou province, it is very poor in my hometown.
May I contact with you? My email is xiangwc@iopp.ccnu.edu.cn.