在过去一个世纪，这个球已经更换迭代七次。
Over the past century, there have been seven iterations of this ball.
事实上在过去一个世纪，沿新南威尔士海岸的海平面上升超过了20厘米。
The fact is that sea levels have risen along the NSW coast by more than 20cm over the last century.
我们看到了这些在过去一个世纪的趋势，但不知道10年后会发生什么。
We looked at these trends over the past century but don't know what will happen 10 years down the road.
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