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宾夕法尼亚州的,或与其相关的。
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宾夕法尼亚州的,或与其相关的。；石炭纪中从3.18亿到2.99亿年前的三个地质时期(早、中、晚)的；以高氧大气和爬行动物及有翅昆虫的兴起为特征。；宾夕法尼亚的
Of or pertaining to the state of Pennsylvania.
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宾夕法尼亚州的,或与其相关的。
Of or pertaining to the state of Pennsylvania.
石炭纪中从3.18亿到2.99亿年前的三个地质时期(早、中、晚)的；以高氧大气和爬行动物及有翅昆虫的兴起为特征。
Of any of the three geologic epochs (lower, middle and upper) within the Carboniferous period from 318 to 299 million years ago; marked by a high oxygen atmosphere and the rise of reptiles and winged insects.
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