Despite the invention of synthetic rubbers, there is often no good substitute for the real thing, for nothing artificial yet matches natural rubber's resilience and strength.

尽管人类发明了合成橡胶，但现在没有能替代天然橡胶的好产品，因为人工合成橡胶弹力和强度还无法和天然橡胶相比。

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It was a natural object, it was nothing artificial.

这是个自然天体，不是人造的。

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It contains nothing artificial, absolutely no additives and furthermore, the provenance of the milk used to make it is well known: it contains no antibiotics, no steroids and no growth hormones.

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Artificial hearts are nothing new: AbioMed implanted its first replacement heart unit in 2001, and as far back as the 1980s the considerably more cumbersome Jarvik 7 was unveiled to the public.

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