发令枪未响就抢先跑出 jump the gun
等着发令枪响！
比赛于2点整正式开始，随着发令枪响，选手们争先恐后冲出起跑线，为企业的荣誉奋力一搏。
When the starting gun was fired at 2:00 p. m. , the participants threw themselves forwards from the starting line like arrows---they made all out efforts for the honor of their companies.
在冷战中，这个消息震惊了世界，并给美国人带来巨大冲击，同时也是两个超级大国间太空竞赛的发令枪响。
It was a surprise to the world, a shock to many Americans, and the starting gun for the space race between the superpowers.
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