VOA慢速英语:'A Horseman in the Sky' by Ambrose Bierce

trigger - n. a lever on a gun that you pull to fire the gun

fantasy – n. something that is produced by the imagination : an idea about doing something that is far removed from normal reality

ambush - n. an act of hiding, waiting for others to appear, and then suddenly attacking them : a surprise attack

dizzy - adj. feeling that you are turning around in circles and are going to fall even though you are standing still

reins – n. a strap that is fastened to a device (called a bridle) placed on the head of an animal (such as a horse) and that is used to guide and control the animal — usually plural