19世纪以前，几乎没有社会流动的渠道。
Prior to the nineteenth century, there were almost no channels of social mobility.
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.
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.
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.
在19世纪30年代以前，美国的大多数报纸都是通过年度订阅销售的，通常是一年8到10美元。
Before the 1830s, most newspapers were sold through annual subscriptions in America, usually $8 to $10 a year.
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.
巨石阵建于许多世纪以前。
就像以前的牛仔一样，21世纪的牛仔甚至会在寒冷的早晨早早起床，在火上做早餐。
Like the cowboys of the past, a 21st-century cowboy even gets up early on freezing cold mornings and makes breakfast over a fire.
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.
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.
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.
故事发生在大约半个世纪以前。
一个半世纪以前，狄更斯在年青的美国大街上走，看到他的小说被盗版贱卖，也相当气愤。
A century and a half ago, Charles Dickens walked the streets of young America and fumed to see his novels in cheap pirate versions.
十九世纪早期以前，书籍都是使用笨重的材料，如木头、皮革、金、银和宝石等手工装订而成的。
Before the early nineteenth century, books were hand-bound using heavy materials such as wood, leather, gold, silver and jewels.
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.
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.
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.
然而几个世纪以前，兰花还是稀有珍贵之物，如今在许多家庭和办公室里都可以见到。
While considered rare and valuable some centuries ago, they may be seen today in many homes and offices.
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.
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.
她是英国人，在那时--半个世纪以前，她成为我们这个爱尔兰海滨小镇的“外星人”。
She was English, which in those days — we are speaking of half a century ago — made her an exotic species in our little Irish seaside town.
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.
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.
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.
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