Many of the lakes around the Grand Tetons were formed millions of years ago by slow-moving sheets of ice.
VOA: special.2009.02.16
That ratio may have been higher in the nineteenth century; it's gradually trending down, but it's a slow-moving thing.
在19世纪这个比率要高一些,然后逐渐下降,但这是个缓慢变化的过程
Let me just give some example of-- sometimes people are very slow to see the obvious, or it seems so in history.
我来举些例子-,有时人们对显见之物的反应反而比较滞后,起码从历史上来看是这样的。
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