15世纪末时，玻璃制造工业已经开始萌芽，并随之出现了高质的无色玻璃。

By the late 15th century, the glassmaking industry was burgeoning, and with it came the creation of high-quality colorless glass.

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在这个问题中你会得到三个回收废品箱，每个都包括给定数量的棕、绿或无色玻璃瓶。

In this problem you will be given three recycling bins, each containing a specified number of brown, green and clear bottles.

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几百年后，威尼斯制出了一种相对无色的玻璃。

Hundreds of years later, a comparatively colorless glass was made in Venice.

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