It is estimated that this mutation occurred forty million years ago. This piece of wood has not been petrified after millions of years . 这两个星系在数百万年 前相互擦拭,现在相隔24,000光年。 The two galaxies sideswiped each other millions of years ago and are now 24,000 light-years apart. Natural stone is formed when mineral sediments are exposed to millions of years of heat and pressure. 这种古老的鱼曾被人们认为在数百万年 前就已经从地球上消失了。 They thought the fish had disappeared from the Earth millions of years ago.
Natural stones are formed when mineral sediments are exposed to millions of years to the earth's natural heat and pressure. 科学家认为,南秧鸡在数百万年 前从澳大利亚飞到了新西兰。 It is believed that the ancestors of the takahē flew to New Zealand from Australia millions of years ago. It is bod treated as a body part that lost its function millions of years ago. 永恒族是由天神创造的,他们在数百万年 前来到地球,并对早期人类进行了实验。 The Eternals were created by the Celestials, who came to Earth millions of years ago and experimented with early humans. 更重的元素在数百万年 后加入该混合物,早期恒星形成这些元素并在其死后将其驱散。 Heavier elements joined the mix millions of years later, after early stars forged those elements and then dispersed them when they died. 这两个星系在数百万年 前相互擦拭,现在相隔24,000光年。 Both galaxies surpassed each other millions of years ago and are now 24,000 light-years apart. 之所以选择这些种子,是因为它们是在这些煤被燃烧的时代形成的,而那些煤是在数百万年 前形成的。 The seeds were chosen because they formed at the time the coal was burned, whereas the coal formed millions of years earlier. 人类仍在进化-我们可以看到它发生进化不仅仅发生在数百万年 ,它可能发生在我们眼前。 Evolution doesn't just happen over millions of years - it can occur right before our eyes. 在数百万年 之后,恒星将可能完全胜出,整座尘埃山都将被蒸发掉。Within a few million years , the stars will likely win out completely and the entire dust mountain will be destroyed. 然而当太阳(在数百万年 间)逐渐变热,仅仅10亿年内,地球可能会变得太热而无法孕育生命。 However, as the Sun grows gradually hotter(over millions of years ), the Earth may become too hot for life in only a billion years' time. 部分科学家说,这发生在数百万年 之间,其他科学家则认为高度集中在20万年期间。 Some scientists say the die-off occurred over millions of years , while others argue it was highly concentrated in a 200 000-year period. Evolution doesn't just happen over millions of years - it can occur right before our eyes. 费舍尔也认同,爱情在数百万年 前出现是为了推动物种的发展。 Fisher agrees that love came about millions of years ago to advance the species. 这个区域可能在 过去数百万年 间一直在持续不断的产生新生恒星。 The region may have been churning out stars for several million years . 我们与植物的共生已经在数百万年 的过程中发展起来了,但是我们可以把它毁了。 We have built up symbiotic relationship with plants over millions of years but we could ruin this in decades…. 什么是裂谷?裂谷就是地球的某一部分,在数百万年 间慢慢分开,创造出山脉、湖泊、山谷和火山。 A rift is where sections of the earth are slowly spreading apart over millions of years , creating mountains, lakes, valleys and volcanoes. 彼得约翰逊也说,“传染病在数百万年 中强烈塑造了人类的历史和文化。 Pieter Johnson also chimes in, saying,"Infectious diseases have strongly shaped human history and culture over millions of years .". 然而,在数百万年 前,这个彗星云团拖着海王星进入一个新的轨道。 Over hundreds of millions of years , however, that cometary cloud dragged Neptune into a new orbit. 达尔文的这个可悲结果说明在数百万年 的概念上妥协的危险。 This sad outcome for Darwin shows the baneful danger of compromise with the concept of millions of years . 了解这个地峡在数百万年 前如何形成对我们理解西半球生物如何演化至关重要。 Understanding how this isthmus appeared millions of years ago is critical to our knowledge of how life evolved in the Western Hemisphere. 这些变化大部分发生在数百万年 甚至更长时间的很长时间内。 Most of these changes occur on very long timescales of millions of years or more.
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