n.旁轨,侧线,次要地位
vt.导入侧线,转移目标,使受牵制
dog poop on the sidewalk
便道上的狗屎
He avoided stepping on the crack in the sidewalk.
他避免踩到人行道的裂缝上.
Pieces of paper were skittering along the sidewalk.
人行道上飞舞着一张张纸片。