【英语时差8,16】不粘锅的奥妙（下）（在线收听）

 Getting this slippery substance to stick to a frying pan is a bit of a trick. Teflon is broken into a fine powder and suspended in water. The pan is then thoroughly cleaned, then roughened by sand-blasting. The Teflon is sprayed onto the pan and baked, causing it to fuse together and lock onto the roughened surface of the pan. As long as you don’t scratch this protective coating, years worth of fried eggs, melted cheese, burned milk even toffee will slide away effortlessly.