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玻璃的出现,已经是很早很早的事情了;几千年以前,古埃及人已经会制造这种透明的建筑材料。玻璃是人类劳动中值得骄傲的创造;它发展到今天,已经有了不可胜数的用途。从古至今多少科学家研究过,并继续不倦地研究着玻璃;可是大家都知道,玻璃的根本缺点——脆性,却未能很好地克服,也就是说玻璃经不起碰击,容易碰碎,碎片又会飞散伤人。显然把它在交通工具上就用,特别是在高速度而且有震动的飞机上装配,是不大妥当的。人们也曾想到过一些补救的办法,因此就出现了一种所谓安全
The appearance of glass has been a very early and early thing; thousands of years ago, the ancient Egyptians had already made this transparent building material. Glass is a proud creation in human labor; it has grown into use today. How many scientists have studied it since ancient times and continue to study glass tirelessly; but as we all know, the fundamental shortcoming of glass - brittle, but it has not been well overcome, that is to say the glass can not withstand the touch, easy to touch Broken pieces will fly to hurt people. It is obviously not appropriate to use it on vehicles, especially on high-speed, vibrating aircraft. People had thought of some remedies, so there was a so-called safety