But some also believe that a gamma ray burst was responsible for the Ordovician extinction around 455 million years ago.
但是也有一些科学家认为伽玛射线爆发可能是四十五亿年前奥陶纪大灭绝的罪魁祸首。
Ordovician
/ˌɔ:dəu'viʃən/
英汉-汉英词典
- n. 奥陶纪,奥陶系
- adj. 奥陶纪的
词组 | 习惯用语
您要查找的是不是：
- artificial adj. 人造的；虚伪的；武断的
- ordinance n. 条例,法令
Middle Ordovician 中奥陶世
Ordovician Period 奥陶纪
ordovician n. 奥陶系，奥陶纪; adj. 奥陶纪的;
ordovician period 奥陶纪
网络短语:
Ordovician 奥陶纪; 奥陶系; 奥陶系的;
Ordovician carbonate 奥陶系碳酸盐岩
Ordovician stratigraphy 奥陶纪地层
Ordovician oils 奥陶系原油
Lower Ordovician 早奥陶世；下奥陶纪；下奥陶统
Ordovician crudes 奥陶纪石油
Ordovician limestone 奥陶系灰岩; 奥灰;
Pre-Ordovician 前奥陶纪
Ordovician system 奥陶系
英语例句库
- This character differs from other Ordovician source rocks elsewhere in the world such as Kukersite Kerogen in Estonia and Guttenburgen type source rocks in USA.
其组成主要有底栖宏观藻类、线叶植物、隐孢子、疑源类和几丁虫等。 - It's a residual mountain(unaka) which were a set of thrust blocks under the erosion unconformity.It's reservoir pore space is a fracture-vug-pore system of Ordovician carbonate karst.
该气藏的构造为道冲构造侵蚀而成的残丘山,储集体为奥陶系碳酸盐岩溶蚀缝洞孔体系,流体呈层状分布(集中分布于奥陶系峰峰组和上马家沟组上段)。 - From 2003 to 2004, we collected a large amount of Nautiloid and Graptolite fossils in upper metamorphic formations of Mayigangri area and determined the age to be middle and Late Ordovician-Silurian.
在羌塘南部地区发现有可靠化石依据的早古生代地层存在尚属首次。
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原声例句
跟马修学英语
万物简史
The Ordovician (440 million years ago) and Devonian (365 million) each wiped out about 80 to 85 percent of species.
奥陶纪（44000万年以前）和泥盆纪（36500万年以前）分别消灭了大约80%——85%的物种。
AsapSCIENCE - Nature
440 million years ago was the The Ordovician extinction.
4.4亿年前是奥陶纪大灭绝。
PBS Eons | fauna&flora
This is known as the Great Ordovician Biodiversification Event.
这被称为奥陶纪生物多样性大 事件。
Journeys Through Geologic Time
Before the Ordovician, terrestrial life was probably limited to microbes.
在奥陶纪之前，陆地生命 可能仅限于微生物。
Journeys Through Geologic Time
470 million years ago, in the Ordovician Period, the first plants began to live on land.
7亿年前，在奥陶纪， 第一批植物开始生活在陆地上。
PBS地球-动物趣闻
And there are extensive black shale deposits in places like China and northern Africa, dating to the late Ordovician.
在中国和北非等地有大量黑色页岩矿床，可追溯到晚奥陶世。
Life Noggin
The very first mass extinction we know of is the Late Ordovician extinction that took place 450 million years ago.
我们所知道的第一次大灭绝是发生在 4.5 亿年前的晚奥陶世大灭绝。
PBS地球-动物趣闻
By the time the Cambrian had segued into the Ordovician, cephalopods had entered a golden age.
当寒武纪进入奥陶纪时，头足类动物进入了黄金时代。
PBS地球-动物趣闻
The Ordovician endoceratids cephalopods were the biggest animals of their time, reaching an impressive 6 meters in length.
奥陶纪的头足类动物是当时最大的动物，身长可达 6 米， 令人印象深刻。
中文百科
奥陶纪
奥陶纪（英语：Ordovician，符号O）是地质时代中显生宙古生代的第二个纪，约开始于4.9亿年前，结束于4.38亿年前。“奥陶”（Ordovices）原是英国威尔士一古代民族名，后被地质学家用来作地质年代名。中文名称源自旧时日本人使用日语汉字音读的音译名“奥陶纪”（音读：オードーキ，罗马字：ōdōki）。奥陶纪可分为早奥陶世、中奥陶世、晚奥陶世。
英语百科
Ordovician 奥陶纪
The Ordovician (pronunciation: /ɔːrdəˈvɪʃən/) is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 and 443.8 million years ago. It follows the Cambrian Period and is followed by the Silurian Period. The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam Sedgwick and Roderick Murchison, who were placing the same rock beds in northern Wales into the Cambrian and Silurian periods, respectively. Lapworth, recognizing that the fossil fauna in the disputed strata were different from those of either the Cambrian or the Silurian periods, realized that they should be placed in a period of their own. While recognition of the distinct Ordovician period was slow in the United Kingdom, other areas of the world accepted it quickly. It received international sanction in 1960, when it was adopted as an official period of the Paleozoic Era by the International Geological Congress.
近义、反义、联想词
近义词
n.period, geological period
联想词
- inflow boudary condition的意思
- inflow boundary的意思
- inflow boundary condition的意思
- inflow current的意思
- inflow的意思
- inflow effective的意思
- inflow entrance的意思
- in flower的意思
- inflow的意思
- inflowing的意思
- inflowing air的意思
- inflow的意思
- Inflow jet的意思
- inflow lake的意思
- inflow Mach number的意思
- inflow mixer的意思
- Inflow Obstructions,Ventricular的意思
- Inflow Obstruction,Ventricular的意思
- inflow of bank deposits的意思
- inflow of capital的意思
- inflow of fund的意思
- inflow performance relationship的意思
- inflow performance relationship curve的意思
- inflow perturbation的意思
- inflow phenomenon的意思