But in the late nineteenth century, that panoply of possibilities began to fall away with the arrival of a totally new kind of material - celluloid, the first man-made plastic.

但到了十九世纪末，那种盛况随着一种全新材料的兴起而衰落，这就是赛璐珞，第一种人工合成的塑料。

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This new man-made material feels like real leather.

这种新型人造材料摸起来像真皮一样。

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The experiment could open the door to production of artificial organisms whose original genetic material is replaced entirely by man-made DNA, the researchers said.

研究人员称，这项试验打开了一扇门，可以用人造dna完全替换细菌原有的遗传物质制造出人工生物体。

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The material that went into Fat Man, the plutonium bomb detonated over Nagasaki, was made at Hanford, which at its peak consisted of nine nuclear reactors and five plutonium reprocessing plants.

ECONOMIST: Trouble stalks America��s biggest clean-up