250 million years ago is the Permian extinction.
二叠纪大灭绝发生在2.5亿年前。
Permian
/ˈpə:miən/ /ˈpɚmiən/
英汉-汉英词典
- adj. [地]二叠纪的
- n. 二叠纪
词组 | 习惯用语
permian period 二叠纪
middle permian 中二迭世
英语例句库
- Permian bioclastic limestone and bioherm are the most favorable reservoirs.
二叠系生屑灰岩和生物礁为最有利的储层。 - According to the conodont and fusulinid fossils,their ages are determined to be Devonian-Permian.
根据所含化石确定地层形成时代为泥盆纪至二叠纪。 - Along with the similarly large dinocephalia, the bradysaurs constituted the herbivorous megafauna of the late Middle Permian Period.
缓龙与类似大小的恐��兽类都是中二叠纪的草食性巨型土壤生物。 - At the end of the Permian period the earth's landmasses were configured into one supercontinent, Pangea, and a superocean, Panthalassa.
二叠纪末期，地球上的陆地合并成一块超级大洲，叫作盘古大陆，以及一个超级大海，叫作原始大洋。 - The secondary dolomite and paleokarst of the Lower Permian Series in Sichuan Basin is one of the important atectonic reserviors in the basin.
四川盆地下二叠统中次生白云岩及古岩溶是下二叠统主要的非构造圈闭储层之一。
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原声例句
Asap SCIENCE 精选
经济学人（汇总）
The bear case rests on patience, a Persian restoration and a Permian boom.
看跌的理由在于耐心，波斯的恢复和二叠纪的繁荣。
万物简史
The Permian event was particularly devastating to sea creatures.
二叠纪事件对海洋动物的破坏性尤其严重。
万物简史
The synapsids divided into four streams, only one of which survived beyond the Permian.
下孔亚纲分成四支，只有一支闯过了二叠纪。
经济学人-科技
The idea that an impact caused the Permian extinction has been around for a while.
导致二叠纪大灭绝的原因长期以来都没有一个定论。
经济学人-科技
Presto! The Permian mass extinction is explained.
就这样！这就是二叠纪物种大灭绝的解释。
经济学人-科技
At the end of the Permian, the extinction figure was more than 80%.
在二叠纪末期，那场大灭绝带走了超过80%的物种。
VOA慢速英语_科技
The researchers said they see similarities between the Permian mass extinction and today's climate change problem.
研究人员说，他们看到了二叠纪集群绝灭和如今气候变化问题之间的相似之处。
PBS趣味科普
Here in the Permian, we also start to see the first evidence of walking on two legs.
在二叠纪时期，我们也第一次发现了有些动物开始靠两条腿行走的证据。
VOA慢速英语_科技
The event took place at the end of what Earth scientists, or geologists, call the Permian Period.
这一事件发生在地球科学家或地质学家所说的二叠纪末期。
中文百科
二叠纪
二叠纪（Permian）是约2.9～2.5亿年前古生代的最后一个地质时代，在石炭纪、三叠纪之间。定义二叠纪的岩石层是比较分明的，但开始、结束的精确年代却有争议。其不精确度可达数百万年。以往，二叠纪为二分，目前二叠纪使用三分法：Cisuralian、Guadalupian、乐平世（Lopingian）。Permian源自俄罗斯的彼尔姆州。中文译为二叠纪一说是在德国的同年代地层的上层是镁质灰岩，下层是红色砂岩之故。
英语百科
Permian 二叠纪
![Geography of the Permian world](/Images/godic/202502/02/280_Ma_plate_tectonic_reconstruction0041.png")
![Selwyn Rock, South Australia - an exhumed glacial pavement of Permian age](/Images/godic/202502/02/Selwyn_Rock_20042.JPG")
![Hercosestria cribrosa, a reef-forming productid brachiopod (Middle Permian, Glass Mountains, Texas).](/Images/godic/202502/02/HercosestriaPair0401110042.jpg")
![The Permian–Triassic extinction event, labeled](/Images/godic/202502/02/Extinction_Intensity.svg0042.png")
The Permian is a geologic period and system which extends from 298.9 to 252.17 million years ago. It is the last period of the Paleozoic, following the Carboniferous and preceding the Triassic of the Mesozoic. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the ancient kingdom of Permia.
近义、反义、联想词
近义词
n.period, geological period
联想词
英英词典
permian n.
- from 280 million to 230 million years ago; reptiles
synonymous： Permian period