柯林斯词典to and fro →see to 返回 to and fro剑桥词典in one direction and then in the opposite direction , a number of times 往复地；来回地 She was gazing out the window , rocking rhythmically to and fro . 她注视着窗外，身体有节奏地来回摇晃着。 返回 to and fro