Although my brother couldn't speak French, he was top in his class at counting backward by threes.
虽然我哥哥不能讲法语，但他在他们班里一至三的倒数计算却名列第一。
The counting backward aloud from an arbitrary starting number to indicate the time remaining before an event or operation, such as the launching of a missile or space vehicle.
的翻译是：从一个落后的数数声，任意起始编号指示剩余的时间事件发生前的一或操作，如发射导弹或航天器。
She was looking out the window and counting - counting backward.
她望着窗外，在计数——倒数上来。
She was looking out the window and counting - counting backward.
她望着窗外，在计数——倒数上来。
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