Although my brother couldn't speak French, he was top in his class at countingbackward 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。
2
The countingbackward 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。
3
She was looking out the window and counting - countingbackward.