语音讲解：
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　　Jump the gun

　　过早行动；过早起步

　　to act or speak impulsively or in a rash manner; impatient; to do anything prematurely

　　不假思索，匆忙地做或说；没有耐心的；未成熟前做任何事

　　When learning howto parachute, it’s absolutely essential not to jump the gun and open the parachute too soon after jumping out of the plane.

　　在学习如何跳降落伞时，绝对不能在跳离飞机时就匆忙地打开降落伞。