“upper carboniferous”例句

单词	upper carboniferous
例句	DEFINITIVE EXAMPLES 权威例句〔coal measures〕Coal Measures A stratigraphic unit equivalent to the Pennsylvanian or Upper Carboniferous periods. Coal Measures 煤系：地层单位，相当于美国宾夕法尼亚纪或上石炭纪时期的地层单位美国传统

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“upper branch”例句

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