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翻译：crude petroleum is not an equilibrium mixture, and on a geological time scale its composition is slowly changing. S.R.silverman found that heating at 121C for two weeks caused detectable changes, the low-molecular-weight components formed being isotopically lighter so far as the carbon was concerned, than the original.
【参考答案】
天然石油不是均衡的混合物，在一个地质时期，地质构造改变十分缓慢，S.R.silverman研究发现，经过两周持续在121......
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