单词	kerogen
释义	kerogen /ˈkɛrədʒ(ə)n / noun [mass noun] A complex fossilized organic material, found in oil shale and other sedimentary rock, which is insoluble in common organic solvents and yields petroleum products on distillation.The bulk of organic matter in sedimentary rocks is in the form of kerogen: complex polymeric material that is insoluble in inorganic solvents, and difficult to analyse chemically.... These indices are independent of the organic matter abundance and strongly related to the elemental composition of kerogen. It should be mentioned that the bulk of reduced carbon on Earth is sediment-bound kerogen, which most probably is of biological origin. Origin Early 20th century: from Greek kēros 'wax' + -gen.
随便看	a trouble shared is a trouble halved at sea at second hand ATSIC at sign Atsina at sixes and sevens at someone's back at someone's beck and call at someone's command at someone's disposal at someone's expense at someone's feet at someone's pleasure at source at speed at stake at stool AT&T attaboy attacca attach attachable attached attacher

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