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The washington , dc-based think tank crunches some interesting numbers :

这家位于华盛顿的智库对下面这些有趣的数字进行了一番计算：

Credit crunches are rare in american economic history , and don 't tend to last long .

信贷紧缩在美国经济历史上较为罕见，往往也不会持续很长时间。

Try push-ups , abdominal crunches and leg squats .

试试俯卧撑，仰卧起坐和下蹲起立。

Tumbling stock markets and credit crunches always unnerve .

不断下挫的股市和信贷紧缩总是令人失去勇气。

Such software crunches data on each aircraft 's performance and other traffic in the air or at airports to determine the optimal flight plan .

这款软件能够迅速处理每架飞机的空中飞行数据和其他地空交通状况，以制定最佳飞行计划。