hair.pin
n.(名词)A thin, cylindrical strip of metal or other material bent in the shape of a long U, used by women to secure a hairdo or headdress.发夹:一个由金属或其它材料制成,被弯成一个长U形的细瘦的柱形长条,用来固定妇女的发型或发式Something shaped like a hairpin, especially a sharp turn in a road.发夹状物:形状象发夹的物体,尤指公路的U形急转弯