back-and-forth
名词: back-and-forth
back-and-forth基本解释
来回地； 反复地back-and-forth同义词
back-and-forth英英释义
"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"
