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to and fro是什么意思

to and fro

美[tuəndfroʊ]  英[tuændfrəʊ]
  近义词:backwardandforward,backandforth,

英英释义

Adverb
  1. 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"

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