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The ubiquity of phenanthrene series, chrysene series compounds, perylene and retene compounds in the sediment indicated that PAHs mainly came from the terrestrial plants.

在检测到角鲨烯，表明这一地区存在生甲烷合成和细菌作用，具有生成油气气水合可能性。

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相似单词

3G, 401(K), a,

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