| 单词 | 亿年 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔ABOUT/APPROXIMATELY〕The universe is estimated to be somewhere in the region of eleven billion years old. 宇宙估计有大约110亿年的历史了。朗文写作活用〔ALIVE〕The new evidence seemed to indicate that life existed on Mars billions of years ago. 这些新的证据似乎表示，火星几十亿年前就有生命存在了。朗文写作活用〔DEVELOP〕The process of biological evolution has taken billions of years. 生物进化的过程长达数十亿年。朗文写作活用〔JOIN〕About 100 million years ago South America was joined to Africa. 大约在一亿年以前，南美洲与非洲是相连的。朗文写作活用〔SMALL〕A primitive form of microscopic life may have existed on Mars billions of years ago. 微生物的原始形态可能数十亿年前就已在火星上存在了。朗文写作活用〔by.〕Billion years.十亿年的简写美国传统〔calculation〕According to experts' calculations, that star will explode within two billion years.根据专家测算，那颗恒星将在20亿年内爆炸。韦氏高阶〔continental〕The most ancient parts of the continental crust are 4000 million years old.大陆地壳最古老的部分有40亿年历史。柯林斯高阶〔continental〕The most ancient parts of the continental crust are 4000 million years old.这块大陆地壳最古老的部分有40亿年历史。外研社新世纪〔descend from sth〕All living creatures are thought to descend from an organism that came into being three billion years ago.据信所有生物都是从30亿年前出现的一种有机体演变而来的。剑桥高阶〔earth〕Dinosaurs ruled the earth for hundreds of millions of years.恐龙统治了地球几亿年。牛津搭配〔epoch〕Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。柯林斯高阶〔existence〕Modern cosmology believes the universe to have come into existence about 15 billion years ago.现代宇宙论认为，宇宙大约在150亿年前就已经形成了。剑桥高阶〔farthest〕Light from the farthest stars takes three thousand million years to reach us.从最遥远的恒星发出的光需要30亿年才能到达我们这里。麦克米伦高阶〔form〕The rocks were formed more than 4000 million years ago.这些岩石是 40 多亿年前形成的。朗文当代〔form〕The stars must have formed 10 to 15 billion years ago.这些恒星一定是在100亿至150亿年前形成的。外研社新世纪〔form〕The stars must have formed 10 to 15 billion years ago.这些恒星一定是形成于 100 到 150 亿年前。柯林斯高阶〔lay down〕The steep-sided valley is of carboniferous limestone laid down as mud some 330 million years ago.山谷陡峭的一侧是石炭纪石灰岩, 在大约3.3亿年前由淤泥沉积而成。外研社新世纪〔living fossil〕The coelocanth is a living fossil that has existed for hundreds of millions of years.腔棘鱼是已存在好几亿年的活化石。朗文当代〔radiometric〕These rocks have been d ated radiometrically at two billion years old.经辐射能探测，这些岩石于 20 亿年前形成。牛津高阶〔reckon〕The age of the earth is reckoned at about 4 600 million years.估计地球的年龄大约为 46 亿年。牛津高阶〔separate〕South America and Africa separated 200 million years ago.南美洲和非洲于 2 亿年前分离。牛津高阶〔separate〕South America separated from Africa 200 million years ago.*2 亿年前南美洲和非洲分离。牛津高阶〔timescale〕When considered on the 4.6 billion year timescale of the Earth, our lives can seem insignificant.和地球46亿年的时间标度相比，我们的生命显得如此渺小。韦氏高阶〔vicinity〕All meteorites are of the same age, somewhere in the vicinity of 4.5 billion years old.所有陨石年代都差不多，大概在 45 亿年左右。朗文当代All living creatures are thought to descend from an organism that came into being three billion years ago.一切生物被认为是由30亿年前形成的一种有机体发展而来的。剑桥国际In the four-billion-year history of life, 100,000 years is a twinkling.在四十亿年的生命史中, 100,000 年只是一瞬间。剑桥国际Modern cosmology believes the Universe to have come into existence about fifteen billion years ago.现代宇宙论相信宇宙的形成大约在150亿年以前。剑桥国际Most coal-fields began life as swamps about 300 million years ago.大多数煤田都是由大约三亿年前的沼泽地发展形成的。剑桥国际The solar system was formed 4.5 billion years ago. 太阳系是四十五亿年前形成的。译典通 |
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