当普通退火玻璃打破，它构成相当大的危险。

When ordinary annealed glass breaks, it poses considerable danger.

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对于平板玻璃，热退火是最常用的。

For flat glass, heat tempering is most often used.

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为了结构上的应用，玻璃往往使用传统的方法以增加强度——退火。

For structural purposes, glass is often strengthened the old-fashioned way - by tempering.

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