英日字典: to_and_fro
    The to_and_fro has 1 Senses.
-  backward and forward, to and fro, back and forth
 -  行ったり来たり
 - moving from one place to another and back again; "he traveled back and forth between Los Angeles and New York"; "the treetops whipped to and fro in a frightening manner"; "the old man just sat on the porch and rocked back and forth all day"
 - ある場所から別の場所に移動し、再び戻る
 
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