| 单词 | 始新世 |
| 释义 | 〔Oligocene〕Of, relating to, or being the geologic time and deposits of the epoch in the Tertiary Period of the Cenozoic Era that extended from the Eocene Epoch to the Miocene Epoch. See table at geologic time 渐新世的：新生代第三纪的，从始新世到中新世的地质年代的或沉积物的或与之相关的 参见 geologic time〔hyracothere〕A small herbivorous mammal of the genusHyracotherium (syn. Eohippus ) from the Eocene Epoch of North America, having four-toed front feet and three-toed hind feet and related ancestrally to the modern horse. 始马：北美洲始新世始马属 （与 始祖马属 同义）的小型草食性哺乳类，其前脚为四趾后脚为三趾，与现代马有血缘关系 〔nummulite〕A large, coin-shaped, fossil foraminifer of the genusNummulites, widely distributed in limestone formations from the Eocene Epoch to the Miocene Epoch of the Cenozoic. 货币虫：货币虫 体形大而呈硬币状，化石有孔的虫，从始新世到新生代的中新世广泛分布在石灰岩地层中 〔Paleocene〕Of, belonging to, or designating the geologic time, rock series, and sedimentary deposits of the first epoch of the Tertiary Period, preceding the Eocene Epoch and characterized by the appearance of placental mammals. See table at geologic time 古新代的：属于或是地质时代、岩系的段和沉积矿床第三纪的第一时代的，早于始新世时代并且以胎生哺乳动物的出现为特征 参见 geologic time〔eohippus〕A small, herbivorous, extinct mammal of the genusHyracotherium (or Eohippus ) from the Eocene Epoch of the western United States, having four-toed front feet and three-toed hind feet and related ancestrally to the horse. 始祖马：始新世产于美国西部的一种属于蹄兔 （或 始祖马 )属的哺乳动物，已灭绝，体型小，食草，前蹄四趾，后蹄三趾，为马的远祖 〔chalicothere〕Any of various extinct ungulate mammals of the Eocene to Pleistocene epochs, having distinctive three-clawed, three-toed feet.爪兽：一种已灭绝的始新世和更新世的有蹄哺乳动物，其特征为有三爪，每爪有三趾〔titanothere〕Any of various extinct herbivorous hoofed mammals of the genusBrontotherium and related genera, of the Eocene and Oligocene epochs, resembling the rhinoceros. 雷兽类：一种已绝迹的雷兽属 和其它相关属类的有蹄食草哺乳动物，生长于始新世和渐新世，类似于犀牛 〔Eocene〕Of, relating to, or designating the geologic time, rock series, sedimentary deposits, and fossils of the second oldest of the five major epochs of the Tertiary Period, extending from the end of the Paleocene to the beginning of the Oligocene, and characterized by the rise of mammals. See table at geologic time 始新世的：关于或标明第三纪的五个世中第二世的地质时代、岩系段，沉积矿床和化石的，该世由古新世末期到渐新世初期，以哺乳动物的繁盛为特征 参见 geologic time〔oreodont〕Any of various extinct sheep-sized ruminant artiodactyls of the family Merycoidodontidae, widespread during the Eocene through the Miocene epochs in North America.岳齿兽：岳齿属中现已灭绝的多种体似绵羊的反刍性偶蹄动物中的任何一种，从始新世到中新世时期遍布于北美 |
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