双酚a，也称BPA，用来生产防碎塑料，工业上又叫作聚碳酸酯。BPA无处不在，从矿泉水瓶、医疗器械到及食品包装的内里，都有它的身影。

Bisphenol A. Also called BPA, it's used to make shatter-proof plastic known as polycarbonate, found in everything from water bottles to medical devices to the lining of food packaging.

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它的身影到处都有，却唯独不在现实世界出现。

Everywhere, that is, except in the real world.

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摘要：电气工程及其自动化的触角伸向各行各业，小到一个开关的设计，大到宇航飞机的研究，都有它的身影。

Abstract: The electrical engineering and automation are reaching all walks of life to a single switch design, large space flight research, has its shadow.

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