Some advanced materials are an old standard with a new twist. The newest fiberoptic cables that carry telephone calls cross - co

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问题 Some advanced materials are an old standard with a new twist. The newest fiberoptic cables that carry telephone calls cross - country are made of glass so transparent that a piece of 100 miles thick is clearer than a standard window pane.

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答案有些高级材料是带有新方法的老标准。最新全国电话的光纤电缆由玻璃制成。这种玻璃透明度极高，一片100英里厚的玻璃比一块标准的窗框玻璃还要清晰透明。

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