"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"
backward and forward是什么意思 backward and forward在线翻译 backward and forward什么意思 backward and forward的意思 backward and forward的翻译 backward and forward的解释 backward and forward的发音 backward and forward的同义词
