a machine moves back and forth ,just like life one foot and

a machine moves back and forth ,just like life one foot and The road moves back and forth and around corners是什么意思? back and forth withone back and forth 歌词 back and forth go back and forth we don't have to just email back and forth Back and forth they argued life is just like a game and a dream !是什么意思? (back and forth)这个英文是什么意思? back -and- forth demodulator何意 It was like the buildings were swaying back and forth 这里的lik