Secondary in abundance are aromatic sester and sesquiterpenoid hydrocarbons,but aromatic diterpenoids, most of the regular PAH are found at trace levels only.
香二萜类，大多数常规多环烃仅以微量形式存在。
Secondary in abundance are aromatic sester and sesquiterpenoid hydrocarbons,but aromatic diterpenoids, most of the regular PAH are found at trace levels only.
香二萜类，大多数常规多环烃仅以微量形式存在。
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