亿年前

• Web - page . made in japan analysis certificate by japan food research laboratories
  早在20亿年前，绿藻已经存在地球上。
• What prompted the leap in complexity starting 1 . 5 billion years ago
  那么是什么推动了发生在15亿年前的复杂性的飞跃呢？
• About 13 . 7 billion years ago a tremendous explosion started the expansion of the universe
  大约13 . 7十亿年前巨大爆炸开始了宇宙的扩展。
• Just as the solar system was forming some 4 . 6 billion years ago , it turned itself inside out
  太阳系的形成发生在大约46亿年前，那会儿它里外翻了个身。
• For example , the researchers date the split between plants and animals at 1 . 6 billion years ago
  例如，研究者确定植物和动物大概是在16亿年前开始产生差异。
• As to explosion , the most violent one ever happened about 13 . 7 billion years ago - the big bang
  说起爆炸，最猛烈的应是约一百三十七亿年前的宇宙大爆炸了。
• Diamonds have been found in some of earth ' s oldest rocks , dating back to 4 . 3 billion years ago
  钻石被发现在地球上最古老的岩石里，时间可以追溯到43亿年前。
• Starting several billion years ago , matter has been losing control to cosmic acceleration
  物质自数十亿年前便开始渐渐将宇宙演化的主宰权交给了加速膨胀的机制。
• Our oldest fossils date to roughly 3 . 5 billion years ago , and consist of bacteria microfossils
  我们的最旧的化石约会对大致3 . 5十亿年前,和包括细菌microfossils 。
• Our sun and our solar system may have been born inside such a cosmic crucible 4 . 6 billion years ago
  我们的太阳和太阳系或许就是46亿年前在这样的宇宙熔炉中诞生的。