一个世纪以前，石油资源是一大问题。
一个世纪以前，很少有人一天刷几次牙。
A century ago, few people regularly brushed their teeth multiple times a day.
在十九世纪以前，对海洋感兴趣的科学家寥寥无几。
Before the nineteen century, scientists with an interest in the sea were few and far between.
许多世纪以前，在西非，传统的说书人一边讲故事，一边演奏乐器。
Many centuries ago, in West Africa, traditional storytellers played musical instruments while they were telling stories.
仪器上记录的年代不够久远，因而无法可靠地提供一个世纪以前全球气候变化的测量值。
Instrumental records do not go back far enough to provide us with reliable measurements of global climatic variability on timescales longer than a century.
这些大坝建于近一个世纪以前，是为洛杉矶港的木材和造纸厂提供电力的，大坝阻断了6种鲑鱼的上游产卵地。
Built nearly a century ago to provide power to lumber and paper mills in the town of Port Angeles, these dams blocked access to upstream spawning beds for six species of salmon.
巨石阵建于许多世纪以前。
在十九世纪以前，对海洋感兴趣的科学家寥寥无几。
Before the nineteenth century, scientists with an interest in the sea were few and far between.
故事发生在大约半个世纪以前。
然而，第一个慢性中毒病例发生在半个世纪以前。
However, the first chronic case took place half a century ago.
伦敦作为商贸中心的基础可以追溯到许多世纪以前。
London's roots as a centre of commerce stretch back many centuries.
他的口音半世纪以前就都该了，可是现在又回来了。
He'd purged most of his accent nearly half a century ago, but now it had returned.
在某种程度上，通用的问题可以追溯到一个世纪以前。
In some ways, GM's problems can be traced to its origins a century ago.
一个世纪以前，女性几乎没有投票权，更别说参选了。
CENTURY ago, women were scarcely allowed to vote, let alone stand for election.
答案是近4个世纪以前——1638年12月21日。
The answer is nearly four centuries ago - December 21, 1638.
早在半个多世纪以前社会学家与人类学家就对这个话题展开了争论。
Sociologists and anthropologists have been debating this topic for over half a century.
上海总会建成于一个世纪以前，曾是英国殖民大亨们频繁光顾的场所。
Built a century ago as the Shanghai Club, it was frequented by British colonial tycoons.
许多世纪以前，在印度的一个邻河的村子里，所有的男子都学做木工活儿。
Many centuries ago, in a certain village near a river in India, all the men were trained as Carpenters.
一个世纪以前，生活在印度阿萨姆邦(assam)的犀牛还不足200头。
Fewer than 200 were left in the north Indian state of Assam a century ago.
在中世纪以前的德国，地方的法院甚至通过菩提树的枝干来寻找真相。
In pre-medieval Germany for instance, local courts would meet under the boughs of a lime tree believing the tree would find the truth.
一个世纪以前，世界上几乎所有的货币都和黄金关联，其余的大部分和白银关联。
A century ago almost all the world's currencies were linked to gold and most of the rest to silver.
两个世纪以前，英国在纺织行业处于领先，老字号公司从那时起就开始提防别人。
Britain bounded ahead in textile production two centuries ago, and established firms have been looking over their shoulder ever since.
几个世纪以前，人类积累的几乎所有知识都能装在若干哲人的大脑之中。
A couple of centuries ago, nearly all the world's accumulated learning could be contained in the heads of a few philosophers.
换言之，现在普通的美国人平均每年比一个世纪以前的美国人多吃50磅以上的肉。
In other words, the average American now eats 50 pounds more meat every year, compared with a century ago.
但是值得回忆的是仅仅在一个世纪以前，重于空气的飞行似乎是个不可能实现的梦想。
But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.
但是值得回忆的是仅仅在一个世纪以前，重于空气的飞行似乎是个不可能实现的梦想。
But it is worth remembering that just over a century ago, heavier-than-air flight seemed an impossible dream.
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