2005年，渔民出海捕捞凤尾鱼、鲑鱼以及黄尾鱼时，开始发现渔猎之中出现了越前水母这种巨大的生物。
Nomura's jellyfish first arrived in Japanese waters in 2005 when fisherman out looking for anchovies, salmon and yellowtail began finding large numbers of the gelatinous creatures in their nets.
与在化石记录14亿年前出现的称为Grypaniaspiralis的第一种真正的多细胞生物相比，这些标本还要更早。
The specimens predate the first truly multicellular organism, called Grypania spiralis, which appeared in the fossil record 1.4 billion years ago.
1亿年前，三叠纪(the Triassic period)结束，此时又出现一次陆地和海洋生物的大灭绝。
The Triassic period ended 210m years ago with another mass extinction of land animals and sea creatures.
双月撞击被假定发生于距今44亿年前，距地球上出现生命还有很久，没有任何生物会仰头凝视双月辉空的奇异画面。
This all supposedly happened about 4.4 billion years ago, long before there was any life on Earth to gaze up and see the strange sight of dual moons.
大约25亿年前，生物界出现了光合作用——把光照、二氧化碳和水转化成糖的能力。
About 2.5 billion years ago, the newest fad in organisms was photosynthesis — the ability to to turn sunlight, carbon dioxide (CO2) and water into sugar.
单细胞生物大约出现于34亿年前的“原始汤”（primordial soup）。
Single-celled organisms emerged from the primordial soup about 3.4 billion years ago.
但是没有34亿年前出现的单细胞生物的历史久。
But they don't beat single-celled organisms that emerged about 3.4 billion years ago.
在我们最早的多细胞生物祖先于数亿年前在地球上出现时，癌症可能就已经存在。
Cancer has probably existed ever since our first multicellular ancestors appeared on Earth hundreds of millions of years ago.
作者写道：“我们应该接受阿尔茨海默病有一天可以通过生物标记物出现的证据在临床前被诊断，而这将最终可引导在疾病症状出现前进行治疗。
We should be open to the idea that Alzheimer's could one day be diagnosed preclinically by the presence of biomarker evidence, which may eventually guide therapy prior to the onset of symptoms.
作者写道：“我们应该接受阿尔茨海默病有一天可以通过生物标记物出现的证据在临床前被诊断，而这将最终可引导在疾病症状出现前进行治疗。
We should be open to the idea that Alzheimer's could one day be diagnosed preclinically by the presence of biomarker evidence, which may eventually guide therapy prior to the onset of symptoms.
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