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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。

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When the last space shuttle readies for launch from the Kennedy Space Center, scheduled for July 8, NASA's giant digital countdown clock will be one of the most watched time pieces in the world.

美最后一架现役航天飞机“阿特兰蒂斯”号将于7月8日在肯尼迪宇航中心进行其最后的一次飞行 ，届时， NASA的巨大倒计时钟将成为最为世人瞩目的计时工具。

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If they do nothing, a countdown clock indicates when the episode will start automatically.

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Financial cable TV shows have taken to putting a countdown clock on the screen.

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The band's return was first hinted at last week, when a 10-day countdown clock appeared on their official website.

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