adj.来来往往的,动摇的,走来走去的;
n.来来往往,往复,动摇;
例句:
Scythes swished to and fro.
长柄大镰刀嗖嗖地来回挥动.
He grew weary of running to and fro on the short track.
他开始对在这节短轨道上开来开去有些厌倦了.
Branches waved wildly to and fro.
树枝猛烈地摇来摇去.