2022年全国硕士研究生招生考试英语（一）试题 真题答案！(4)

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People often complain that plastics are too durable. Water bottles, shopping bags, and other trash litter the planet, from Mount Everest to the Mariana Trench, because plastics are everywhere and don"t break down easily. But some plastic materials change over time. They crack and fizzle. They "weep" out additives. They melt into sludge. All of which creates huge headaches for institutions, such as museums, trying to preserve culturally important objects. The variety of plastic objects at risk is dizzying: early radios, avant-garde sculptures, celluloid animation sills from Disney films, the first artificial heart.
Certain artifacts are especially vulnerable because some pioneers in plastic art didn"t always know how to mix ingredients properly, says Thea van Oosten, a polymer chemist who, until retiring a few years ago, worked for decades at the Cultural Heritage Agency of the Netherlands. "It"s like baking a cake: If you don"t have exact amounts, it goes wrong." she says. "The object you make is already a time bomb."