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(单词翻译:双击或拖选)
Even we can tolerate it only up to a point. 连我们对氧的耐受力也是有限度的。
The oxygen level in our cells is only about a tenth the level found in the atmosphere. 我们细胞里的氧气浓度,只有大气里的大约十分之一。
The new oxygen-using organisms had two advantages. 新的会利用氧的细菌有两个优势。
Oxygen was a more efficient way to produce energy, and it vanquished1 competitor organisms. 氧能提高产生能量的效力,它打垮了与之竞争地微生物。
Others did likewise but then later (much later) migrated to the digestive tracts5 of beings like you and me. 有的也照此办理,但后来(很久以后)又移居到了你和我这样的有消化力地地方。
Quite a number of these primeval entities6 are alive inside your body right now, helping7 to digest your food, but abhorring8 even the tiniest hint of O2. 有相当数量的这类原始实体此时此刻就生活在你的体内,帮助消化你的食物,但厌恶哪怕是一丁点儿氧气。
At first, the extra oxygen they produced didn't accumulate in the atmosphere, 起初,它们所产生的额外的氧没有积聚在大气里,
but combined with iron to form ferric oxides, which sank to the bottom of primitive11 seas. 而是与铁化合,成为氧化铁,沉入了原始的海底。
For millions of years, the world literally12 rusted—a phenomenon vividly13 recorded in the banded iron deposits that provide so much of the world's iron ore today. 有几百万年的时间,世界真的生锈了——这个现象由条形铁矿生动地记录了下来,今天却为世界提供了那么多的铁矿石。
For many tens of millions of years not a great deal more than this happened. 在几千万年时间里,发生的情况比这多不了多少。
If you went back to that early Proterozoic world you wouldn't find many signs of promise for Earth's future life. 要是你回到那个元古代初期的世界,你发现不了很多迹象,说明地球上未来的生命是很有前途的。
Perhaps here and there in sheltered pools you'd encounter a film of living scum 也许,你在这里和平那里隐蔽的水塘里会遇上薄薄的一层有生命的浮渣,
点击收听单词发音
1 vanquished | |
v.征服( vanquish的过去式和过去分词 );战胜;克服;抑制 | |
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2 oozy | |
adj.软泥的 | |
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3 anaerobic | |
adj.厌氧的 | |
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4 bogs | |
n.沼泽,泥塘( bog的名词复数 );厕所v.(使)陷入泥沼, (使)陷入困境( bog的第三人称单数 );妨碍,阻碍 | |
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5 tracts | |
大片土地( tract的名词复数 ); 地带; (体内的)道; (尤指宣扬宗教、伦理或政治的)短文 | |
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6 entities | |
实体对像; 实体,独立存在体,实际存在物( entity的名词复数 ) | |
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7 helping | |
n.食物的一份&adj.帮助人的,辅助的 | |
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8 abhorring | |
v.憎恶( abhor的现在分词 );(厌恶地)回避;拒绝;淘汰 | |
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9 untold | |
adj.数不清的,无数的 | |
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10 runaway | |
n.逃走的人,逃亡,亡命者;adj.逃亡的,逃走的 | |
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11 primitive | |
adj.原始的;简单的;n.原(始)人,原始事物 | |
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12 literally | |
adv.照字面意义,逐字地;确实 | |
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13 vividly | |
adv.清楚地,鲜明地,生动地 | |
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14 glossy | |
adj.平滑的;有光泽的 | |
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