动词短语
中文翻译：来回走动
同义词：
['back and forth', 'back and forth', 'round and round']
例句：
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1. Thestudents were to and fro between the classrooms.
学生们来回穿梭于教室之间。
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2.He was to and fro in his office for hours on end.
他一直在办公室里来回走动，几个小时都不停歇。
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3. The animals were to and fro in the forest, searching for food.
动物们在森林里来回走动，寻找食物。