rec·ti·lin·e·ar /ˌrɛktəˈlɪniɚ/
  (a.)直線的;直進的
  rectilinear
  直線
  Rec·ti·lin·e·al Rec·ti·lin·e·ar a.  Straight; consisting of a straight line or lines; bounded by straight lines; as, a rectineal angle; a rectilinear figure or course. -- Rec*ti*lin*e*al*ly, adv. -- Rec*ti*lin*e*ar*ly, adv.
  ◄ ►
  rectilinear
       adj : characterized by a straight line or lines; "rectilinear
             patterns in wallpaper"; "the rectilinear propagation of
             light" [syn: rectilineal]