到二十世纪初，关于进化速度的问题已经得到了答案，答案支持渐进主义，大多数生物学家对此感到满意。
By the early twentieth century, the question about the rate of evolution had been answered in favor of gradualism to most biologists' satisfaction.
在19世纪50年代末，技术变革的速度加快了。
In the late 1850s the speed of technological change quickened.
蕨类植物已经从它的林地据点向外蔓延了几个世纪，但是最近在整个英国北部和西部，蕨类植物侵入开阔乡村的速度却惊人地增长。
Bracken fern has been spreading from its woodland strongholds for centuries, but the rate of encroachment into open countryside has lately increased alarmingly throughout northern and western Britain.
19世纪40年代，蒸汽船凭借其更快的速度从帆船手中夺取了北大西洋的客运业务。
Steamships captured the North Atlantic passenger business from sail in the 1840s because of their much greater speed.
19世纪40年代，蒸汽船凭借其更快的速度从帆船手中夺取了北大西洋的客运业务。
Steamships captured the North Atlantic passenger business from sail in the 1840s because of its much greater speed.
到20世纪90年代，地球上原有的雨林只剩下不到一半，而且它们每年都继续以惊人的速度消失。
By the 1990's, less than half of the earth's original rain forests remained, and they continued to disappear at an alarming rate every year.
本世纪对文明做出最大贡献的很可能是空调，而美国人导致这一情况发生的速度也同样令人惊讶。
The greatest contribution to civilization in the century may well be the air-conditioning and American leads just as amazing is the speed with which this situation came to be.
在过去的一个世纪里，人类对淡水的使用以超过人口增长率两倍的速度增长。
Over the past century, human use of fresh water has increased at more than double the rate of population growth.
蒸汽的高成本、加上货运对速度的低需求，使得世界上大多数的海运货物都是通过帆船来运输的，直到20世纪初，这一状况才有所改变。
The high cost of steam and the lesser need for speed kept the majority of the world's ocean freight moving by sail until the early years of the 20th century.
他们发现，20世纪80年代之前的产量增长速度在20世纪90年代和21世纪有所放缓，这占据了作物收割面积的24%至39%。
They find that on between 24% and 39% of all harvested areas, the improvement in yields that took place before the 1980s slowed down in the 1990s and 2000s.
我们无法用上个世纪的技术来满足我们所需的速度、容量和覆盖广度。
We can't get to the speeds, capacity, and coverage we need with last century's technology.
照气候科学家解释，这一影响减缓了20世纪由二氧化碳导致全球变暖的速度。
This effect is taken by climate scientists as explaining a slower rate of global warming over the 20th century than carbon-dioxide levels alone would suggest.
据最新研究表示，造成这种后果的罪魁祸首是北极圈上正在不断消失的冰层，若继续按照这种速度融化消失，在这个世纪末的夏季，冰层将完全消失不见。
The culprit, according to a new study, is the Arctic's receding surface ice, which at current rates of decline could disappear entirely during summer months by century's end.
但从物种灭绝的速度来年，在这个世纪末，我们就有可能失去它们中的一半，尤其是在热带雨林和珊瑚礁地区。
But at the rate things are going, by the end of this century, we may well have wiped out half of them, especially in tropical forests and coral reefs.
自60多年前世卫组织成立至今，全球卫生需求已发生翻天覆地的变化，而本世纪最初十年的演变速度更是惊人。
Global health needs have changed considerably since WHO was established more than 60 years ago, and have evolved with exceptional speed during the first decade of this century.
虽然进入20世纪后美国人口增长速度明显放缓，然而也要远远高于任何一个欧洲国家的增长率的。
Though the population growth rate of America slowed down obviously in the 20th century, it was still much higher than that of any European country.
我们担心的是，按照现在的消耗速度，那个地下储存库将在20年内枯竭，而在21世纪末留给地球的将几乎都是游离氦。
The fear is that, at current consumption rates, that underground bunker will be empty within 20 years, leaving the earth almost helium-free by the end of the 21st century.
其中最大的同时也是增长速度最快的银行：汇丰和渣打，一个半世纪前在亚洲成立时就在皇家海军监管下进行海外金融贸易。
The largest of them, HSBC, and Standard Chartered, the fastest growing, were both founded in Asia a century and a half ago to finance trade across seas policed by the Royal Navy.
俄国在那个世纪的东进速度至今看来仍然让人感到惊奇——横跨西伯利亚的一大片陆地，其面积超过月球整个表面积。
The speed of Russia’s eastward advance that century across a Siberian land mass greater than the face of the moon still astounds.
在二十世纪中叶，全世界人口增长的速度远远地高于粮食产量的增长速度。
In the middle of the twentieth century, world population was expanding faster than food production.
一个众所周知的事实是，美国贫富之间的差距在最近一个世纪正以超乎想象的速度扩大。
There is near-universal agreement that the gap in wealth between the richest American and the poorest is widening to levels not seen in nearly a century.
21世纪的电动车好像也是以同样缓慢的速度扩展着。
The spread of electric cars in the 21st century seems to be proceeding at a similar slow pace.
这是19世纪中叶蒸汽动力船舶代替小艇以及20世纪初燃油引擎出租车取代马车的速度。
That was the case when steam ships replaced clippers in the mid-19th century, and when petrol-engined taxis took over from horse-drawn cabs in the early 20th century.
20世纪60年代以来，地下水被抽走的速度已加快了一倍多。
Groundwater is being pumped away at rates that have more than doubled since the 1960s.
尽管需求不足，美国20世纪30年代的潜在生产率增长速度比20世纪任何其他的十年都要快。
Despite a lack of demand, America's underlying productivity grew faster in the 1930s than in any other decade of the 20th century.
传送这个1Mb的软件用时要1小时左右，“堪比”20世纪90年代调制解调器的速度。
Uploading this one-megabyte software update takes around an hour, so its speed is comparable to that of a 1990s modem connection.
2050年将世界人口稳定在80亿或80亿以下。通过自发主动减少出生率，将改变人口以现在的增长速度在本世纪中叶突破90亿的推测。
Stabilization of the world population at 8 billion or below by 2050, through a voluntary reduction of fertility rates, rather than the current trajectory of more than 9 billion by midcentury
2050年将世界人口稳定在80亿或80亿以下。通过自发主动减少出生率，将改变人口以现在的增长速度在本世纪中叶突破90亿的推测。
Stabilization of the world population at 8 billion or below by 2050, through a voluntary reduction of fertility rates, rather than the current trajectory of more than 9 billion by midcentury
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