使泰森在拳台上无敌于天下的不仅是他令人恐惧的重拳，还有他不可思议的速度。
What made Tyson fearsome in the ring was not just his terrifying punching power but his speed.
到这里，我们最好暂停一下，来研究机制中最不可控制、同时也是最不可思议的一个因素：货币流通速度。
At this point we had better pause to examine that least controllable and most mysterious of all elements in the machine, the velocity of money.
尽管它们的变化速度似乎缓慢的不可思议，但相对于地质时期来说，冰川是个快速、强大的雕刻艺术家，仅在数千年时间内就雕刻出了大量的山谷和峡湾。
Though they seem to creep along at impossibly slow speeds, in geologic time glaciers are relatively fast, powerful landscape artists that can carve out valleys and fjords in just a few thousand years.
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