Oligocene

['ɑlɪgo,sin]

解释:

(noun.) from 40 million to 25 million years ago; appearance of sabertoothed cats.

克里斯整理--From WordNet

解释:

(a.) Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods.

(n.) The Oligocene period. See the Chart of Geology.

斐迪南整理

解释:

adj. (geol.) pertaining to a division of the Tertiary series the rocks chiefly of fresh and brackish water origin with intercalations of marine beds.

戈登编辑