事实上，水坝主要是应对水位年变化的一种策略。
In fact, dams are primarily a strategy for dealing with annual variations in water levels.
而之前的年变化报告有4%的涨幅。
The previous report's year-over-year data showed a gain of 4 percent.
在接下来的几个世纪中，海洋的PH值可能比过去3亿年变化的还要大。
Over the next several centuries, oceanic pH may change more than it has in the last 300 million years.
先驱者和演替植物群落据说是以1-500年的时间区间变化的。
Pioneer and successional plant communities are said to change over periods from 1 to 500 years.
在这相对短暂的时间里，人们的生活条件发生了比之前几千年更大的变化。
During this relatively short period of time, greater changes in people's living conditions have occurred than in the thousands of years which preceded.
地球轨道偏心率的变化大约在96000年的一个周期内发生。
Changes in the eccentricity of Earth's orbit occur in a cycle of about 96,000 years.
如今研究池塘的生态学者很可能会发现，池塘在一年之内基本没什么变化。
An ecologist who studies a pond today may well find it relatively unchanged in a year's time.
离心率、倾斜和摆动的变化并不影响地球一年接收到的太阳辐射总量。
Changes in eccentricity, tilt and wobble do not affect the total amount of solar radiation Earth receives in a year.
欧洲书籍最大的变化出现在1439年，当年约翰内斯·古腾堡发明了印刷机。
The biggest change for books in Europe came in 1439, when Johannes Gutenberg invented the printing press.
在过去的10年中，情况已经发生了变化。
与许多其他工业化国家一样，英国在过去100年里经历了重大的变化。
Britain, in common with many other industrialized countries, has experienced major changes over the last 100 years.
到20世纪60年代形势已发生了根本的变化。
变化是悄然发生的，15到20年间不会产生明显效果。
The changes are insidious, and will not produce a noticeable effect for 15 to 20 years.
2004年期间，价格没有大的变化。
不论在事业方面还是在个人方面，对汤姆来说这一年都是有着许多重大变化的一年。
This has been an eventful year for Tom, both professionally and personally.
自1982年以来，意大利的时尚业发生了变化吗？
在过去的十年中，盲目性变化现象多次重复。
Over the past decade, the change blindness phenomenon has been replicated many times.
在过去的20年里，他们发生了很大的变化。
在过去的100年里，英国经历了很大的变化。
Britain has experienced major changes in the last 100 years.
我们可以看到过去几百年里发生的气候变化。
We can see past occurrences of climate change that took place over just a few hundred years.
它可能导致气候在短短几百年内就发生变化。
It can cause the climate to change in just a few hundred years.
这个新发行将是一个长期支持发行，所以，它将可能比其他发行更加保守，巩固过去一年的许多变化。
The new release will be a LTS release, so it will likely be more conservative than other releases and consolidate on the many changes over the past year.
地磁活动是地球磁场的自然变化，其波动周期为11年。
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
在过去的三十年里，英国发生了许多社会变化。
In the past thirty years many social changes have taken place in Britain.
这是更早期的遗迹，这些年一直存在，没有太多变化。
It's relic from earlier times and it has survived all these years without much change.
如果用图表进行展示的话，这些变化呈现出来的曲线很像大家熟悉的曲棍球杆：以往数千年都没什么变化，而在过去的几十年内却突飞猛涨。
If represented graphically, the curve for all these changes looks rather like that well-known hockey stick: with little change over millennia and a dramatic upswing over the past decades.
然后，一切都在1950年发生了变化。你不妨称其为“午餐盒之年”，这在很大程度上要归功于纳什维尔的一家制造商阿拉丁工业公司的一个天才之举。
Then everything changed in the year of 1950. You might as well call it the Year of the Lunch Box, thanks in large part to a genius move by a Nashville based manufacturer, Aladdin Industries.
然后，一切都在1950年发生了变化。你不妨称其为“午餐盒之年”，这在很大程度上要归功于纳什维尔的一家制造商阿拉丁工业公司的一个天才之举。
Then everything changed in the year of 1950. You might as well call it the Year of the Lunch Box, thanks in large part to a genius move by a Nashville based manufacturer, Aladdin Industries.
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