And Expend Less 而且花费较少
Since 1914, scientists have known that birds flying in formation—a V-shape—expend less energy.
自1914年以来，科学家们已经知道，以V字形队形飞行的鸟类消耗的能量更少。
They expend less energy because-just as you may have always suspected-they simply need fewer strides to cover the same ground.
他们消耗的能量少只是因为他们走相同的长度迈了更少的步子。
They expend less energy because-just as you may have always suspected-they simply need fewer strides to cover the same ground.
正如你怀疑的一样，他们消耗更少的能量是因为他们用更少的步子就能走一样远的路。
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