Earth had experienced previous periods of climatic change, and yet agriculture had not been developed.
地球已经历了先前的气候变化，但农业还没有发展起来。
Obviously, that's a little bit slower than previous periods, but I'm optimistic.
显然，这个增长速度比以前慢，但是我很乐观。
In previous periods of warming, for example, many types of animals have displayed reliable trends.
比如，在以前的气候变暖过程中，多种动物都显示出合理的动向。
During the 20th century for the first time we started performing and revisiting music from previous periods.
20世纪时我们第一次开始演奏和回顾过去时期的音乐。
But I had never conceived that designs and strategies of previous periods could be applied literally to the present.
但是，我从来没有设想从前的雄图和战略可以原原本本地适用于现在。
What makes the current cycle different from previous periods of high prices is the rise has hit nearly all food commodities.
与此不同的是，最近的涨价已波及到所有的粮食产品。
Our dealerships havereceived a significantly higher number of orders in December of 2010, farexceeding the normal rate in previous periods.
我们的经销商已经在2010年12月份收到相当多的购车订单 销售量远超于前一段时间的正常销量.
The duration of previous geologic periods was difficult to determine.
以前很难确定地质期的持续时间。
During previous interglacial periods, when glaciers retreated, they left behind open land in their wakes.
在以往的间冰期中，当冰川消退时，它们在尾迹中留下了开阔的土地。
Official PPI data based on the current reference base are not available on previous index reference base periods.
基于当前参考基准的官方生产者物价指数数据在以前的指数参考基准期是不可用的。
Schmittner notes that many previous studies only looked at periods spanning from 1850 to today, thus not taking into account a fully integrated paleoclimate data on a global scale.
齐弥特纳注解说很多以前的研究只研究了从1850年至今这段时期的变化，因此从全球的规模上来说，没有考虑到古气候这个属于整体的数据。
This latest study is generally consistent with previous research by others, which suggests that long periods of sitting are associated with heart attacks and related conditions.
这项研究和其他人先前做过的一些研究的结果大致相符，也就是说，长时间坐着不动和心脏疾病以及其它相关病症有关。
If you keep your shell window open for extended periods, you can quickly repeat a previous command with! NNN, where NNN is the number shown in the prompt for the command.
如果shell窗口打开的时间较长，可以用！nnn快速重复前面的命令，其中的nnn是命令提示符中显示的编号。
Previous analysis of ice cores has shown that the climate consists of ice ages and warmer interglacial periods roughly every 100,000 years.
早先的冰芯分析显示气候的有冰龄和温暖的间冰期大致为100,000年为一个周期。
Therefore, time stamps in previous extended-DST periods also are displayed correctly.
因此，以前的DST延长期中的时间戳也会正确显示。
The weekend death rates were similarly higher in most of the previous time periods, too.
周末死亡率也与大部分以前的时间期限一样的更高。
The practice periods for today's idea are to be undertaken somewhat differently from the previous ones.
今天练习这观念的方式与先前稍有不同。
Previous studies of Treasury market illiquidity span short time-periods and focus on particular maturities.
先前国债市场非流动性跨度短时间的研究只专注于特定的期限。
Some universities, such as Harvard Business School, often report an increase in applicants in periods of economic downturn over previous years.
有些院校，如哈佛商学院，经常报告过去经济衰退时期的申请人数有所增加。
Some universities, such as Harvard Business School, often report an increase in applicants in periods of economic downturn over previous years.
有些院校，如哈佛商学院，经常报告过去经济衰退时期的申请人数有所增加。
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