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发令枪一响，他们跑了出去。
The starting gun blasted and they were off.
《柯林斯英汉双解大词典》
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正式比赛当然都用发令枪了。
A starting gun is used in official track meets.
youdao
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没人告诉你什么时候开始，你错过了发令枪。
No one told you when to run, you missed the starting gun.
youdao
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没人告诉你什么时候开始，你错过了发令枪。
No one told you when to run, you missed the starting gun.
youdao