long residue /ˈlɒŋ ˈɹeɪdɪəl ɛkstˈɛnsəɹ ɒv ˈɹɪst/ n

中文:渣油

Meaning:Residue made up of heavy nonvaporized fractions; it accumulates at the base of the fractionating tower after the hydrocarbons have been separated.

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