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视频对白:
Back and forth across the country.
在全国来来回回。
Back and forth
来回地； 反复地
1.She spent hours every day in the tower room, reading and rereading.
她每天都要在这个塔室里消磨好几个小时，读着，反复地读着。
2.A jump in ballet during which the dancer crosses the legs a number of times, alternately back and forth.
空中交叉跳跃一种芭蕾舞动作，舞者在空中多次前后交叉双腿。
