countdown [ˈkaʊntdaʊn]

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n.倒数计秒；大事临近的时期；准备过程

the act of counting backwards to zero

This is the final countdown for Newcastle Utd.这是纽卡斯尔联队的最后倒计时了。
The director began the countdown ten seconds before the broadcast.距离开播还有十秒，导播开始倒读数。