Competitors are then faced with a grid of apparently random Numbers and letters along with a countdown clock.
竞争者将面对成千上万的表面上随机的数字和字母，还有一个倒计时时钟。
It also can be used to display a timer's countdown clock so you know exactly when the photo will be taken.
它还可以显示倒计时，让你确切地知道拍照还有多长时间。
He kept a "countdown clock" in his briefcase marking the time he had left before his retirement to Washington state.
那段时间里，他一直在自己的公文包里放着一块倒计时钟，显示自己还有多长时间可以向华盛顿州提出辞职。
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