Roller coaster

                 Roller High,low,fast,slow,these are the secret term.Unlock the Mystery of the Roller Coaster.One of the roller coaster I rode was the Big Dipper,In Belmont Park,La Jolla.It was fast that I almost fell.During the big-drop I screamed,the gravity made me carsick like.                                                 The ride was over and there it was Gravity Turn.roller-coaster