万维网在二十年里是如何发展壮大的，以及我们现在对它的依赖程度之大，这些仍然令人难以置信。
It's still incredible how the World Wide Web has expanded in twenty years, and how much we now rely on it.
新屏幕格式的引入被推迟了四分之一个世纪，而颜色尽管在接下来的二十年里被用于特制产品，它也是直到二十世纪五十年代才成为一种常态。
The introduction of new screen formats was put off for a quarter century, and color, though utilized over the next two decades for special productions, also did not become a norm until the 1950s.
在《清洁空气法案》强制要求美国使用无铅气体的二十年里，铅在世界范围内的累积量显著下降。
In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation worldwide has decreased significantly.
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