cretaceous
简明释义
adj. 白垩纪的；似白垩的
n. 白垩纪；白垩系
英英释义
单词用法
白垩纪 |
同义词
| 中生代 | 中生代以恐龙的主导地位而闻名。 | ||
| 白垩纪的 | Fossils from the Cretacean period provide important insights into prehistoric life. | 来自白垩纪的化石为古代生命提供了重要的见解。 |
反义词
| 古生代 | The Paleozoic era is known for the emergence of fish and amphibians. | 古生代以鱼类和两栖动物的出现而闻名。 | |
| 中生代 | The Mesozoic era is often referred to as the age of reptiles. | 中生代通常被称为爬行动物的时代。 |
例句
1.Not exactly outer space then, or the Cretaceous period.
而并不是外太空或是白垩纪。
2.Several other mass extinctions in the geological record have been tentatively identified with large impacts, but none is so dramatic as the Cretaceous event.
地质记录中的其他几次大规模物种灭绝也被认为影响重大，但没有哪一次像白垩纪大灭绝那样夸张。
3.Before the mid-Cretaceous, 100 million years ago or so, flowering plants were scarce: conifers and their relations ruled the landscape.
白垩纪中期之前，也就是说大约1亿年前，开花植物很少见：裸子植物占据着地球的景观。
4.At the end of the Cretaceous, the geological record shows that these seaways retreated from the continents back into the major ocean basins.
地质记录显示，在白垩纪末期这些航道从大陆撤退，回到主要的海洋盆地。
5.Changes in climate before the Cretaceous period caused severe fluctuation in sea level, resulting in the extinction of the dinosaurs.
白垩纪以前的气候变化导致了海平面的剧烈波动，引发了恐龙的灭绝。
6.Though the Cretaceous asteroid cleared the stage, mammals did not really get going until 10m years later, in the Eocene epoch.
尽管白垩纪时小行星撞击地球后为哺乳动物搭起了活动的舞台，但是哺乳动物真正大行其道是100万年以后的事情了，也就是在始新世时期。
7.These animals were not as sensitive to climate changes in the Cretaceous period as they are today.
这些动物在白垩纪对气候变化不像今天这样敏感。
8.Fifty-seven feet long and up to nine tons, spinosaurus started poking his head around the early Cretaceous some 100 million years ago.
57英尺长，9吨重，棘龙在大约1亿年前的白垩纪早期就开始四处活动。
9.So 65 million years ago they've got very good evidence of the cretaceous exctinction event.
人们已经得到了6500万年前白垩纪灭绝事件很好的证据。
10.Many dinosaurs roamed the Earth during the cretaceous 白垩纪 era.
许多恐龙在白垩纪时代漫游地球。
11.The cretaceous 白垩纪 is known for its diverse marine life.
白垩纪以其多样的海洋生物而闻名。
12.The fossils we found in the riverbed date back to the cretaceous 白垩纪 period.
我们在河床中找到的化石可以追溯到白垩纪时期。
13.The end of the cretaceous 白垩纪 marked a significant extinction event.
白垩纪的结束标志着一次重大的灭绝事件。
14.Paleontologists study rocks from the cretaceous 白垩纪 to learn about ancient ecosystems.
古生物学家研究来自白垩纪的岩石，以了解古代生态系统。
作文
The term cretaceous refers to a significant geological period that lasted from approximately 145 to 66 million years ago. This era is part of the Mesozoic Era, often called the 'Age of Dinosaurs.' During the cretaceous period, Earth underwent dramatic changes in climate and geography, leading to the evolution of various life forms. It is characterized by the dominance of dinosaurs, which roamed the land in diverse shapes and sizes. Some of the most famous dinosaurs, such as Tyrannosaurus rex and Triceratops, lived during this time.In addition to dinosaurs, the cretaceous period saw the emergence of flowering plants, which transformed the landscape and provided new food sources for herbivorous dinosaurs. This period also witnessed the development of marine life, including large marine reptiles like mosasaurs and plesiosaurs, which thrived in the oceans. The fossil record from the cretaceous period shows a rich diversity of life, including ammonites, belemnites, and various fish species.One of the most significant events of the cretaceous period was the mass extinction event that occurred around 66 million years ago. This event led to the extinction of approximately 75% of Earth's species, including all non-avian dinosaurs. Scientists believe that this mass extinction was caused by a combination of factors, including a massive asteroid impact and volcanic activity, which resulted in drastic changes to the environment.The study of the cretaceous period is crucial for understanding the history of life on Earth. Paleontologists have uncovered numerous fossils from this time, providing insights into how different species adapted to their environments. The findings from the cretaceous period help scientists piece together the evolutionary history of many modern animals and plants.Moreover, the cretaceous period is essential for understanding the formation of natural resources. Many oil and gas deposits are found in rocks formed during this time, making it a key area of interest for geologists and energy companies. The sedimentary rocks from the cretaceous period often contain organic materials that have transformed into fossil fuels over millions of years.In conclusion, the cretaceous period is a fascinating chapter in Earth's history, marked by the rise and fall of dinosaurs, the advent of flowering plants, and significant geological transformations. Studying this period not only enhances our knowledge of prehistoric life but also provides valuable information about the planet's geological processes and natural resources. As we continue to explore the past, the lessons learned from the cretaceous period remain relevant in understanding the present and future of life on Earth.
术语cretaceous指的是一个重要的地质时期，大约从1亿4500万年前到6600万年前。这个时代是中生代的一部分，通常被称为“恐龙时代”。在cretaceous时期，地球经历了气候和地理上的剧烈变化，导致各种生命形式的演化。这个时期的特点是恐龙的主导地位，它们以多样的形状和大小在陆地上漫游。一些最著名的恐龙，如霸王龙和三角龙，生活在这个时期。除了恐龙，cretaceous时期还见证了开花植物的出现，这改变了景观并为食草恐龙提供了新的食物来源。这个时期还目睹了海洋生物的发展，包括大型海洋爬行动物，如蛇颈龙和巨齿龙，它们在海洋中繁盛。来自cretaceous时期的化石记录显示出丰富的生命多样性，包括菊石、剑齿鱼和各种鱼类。cretaceous时期最重要的事件之一是发生在大约6600万年前的大规模灭绝事件。这次事件导致大约75%的地球物种灭绝，包括所有非鸟类恐龙。科学家认为，这次大规模灭绝是由多个因素造成的，包括一次巨大的小行星撞击和火山活动，这导致环境发生了剧烈变化。对cretaceous时期的研究对于理解地球生命的历史至关重要。古生物学家发现了许多来自这个时期的化石，为不同物种如何适应其环境提供了见解。cretaceous时期的发现帮助科学家拼凑出许多现代动物和植物的进化历史。此外，cretaceous时期对于理解自然资源的形成也至关重要。许多油气储藏在这个时期形成的岩石中，使其成为地质学家和能源公司关注的重点。cretaceous时期的沉积岩通常含有经过数百万年转变为化石燃料的有机材料。总之，cretaceous时期是地球历史上一个迷人的篇章，以恐龙的兴衰、开花植物的出现和显著的地质变化为特征。研究这一时期不仅增强了我们对史前生命的知识，还提供了有关地球地质过程和自然资源的宝贵信息。随着我们继续探索过去，从cretaceous时期学到的教训在理解地球生命的现在和未来方面仍然具有重要意义。
