So,I beg you to accept me for a journey to America."

VOA: special.2010.05.13

Yeah? Doppler principle.. - I beg your pardon?

多普勒效应原理,-能不能再说遍

耶鲁公开课 - 聆听音乐课程节选

I beg your pardon.

能重复一下吗

耶鲁公开课 - 聆听音乐课程节选