缓慢的、持续的变化可能是环境稳定时期的常态，而新物种的快速进化发生在环境压力时期。
Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.
也可以在特定时期内调用该工具一定的次数，帮助您了解随着时间的变化数据库中的变动情况。
The utility can also be invoked a specified number of times within a specified period of time, to help you understand changes over time.
在一定时间范围内，科学家们已经可以准切的指出该地区每周的天气变化，而这也是到目前为止测绘出的最精确的气象历史。
In some stretches, the scientists were able to pinpoint what the region's weather was like from one week to the next — by far the most detailed climate history ever produced.
在这个例子中，这些变化是由建立过程的人定义的，目的是表达在生命周期的这一特定时刻对任务执行的精确集中。
In this example, these changes were defined by the author who created this process to express the exact focus of the task performance for each occurrence at this particular point in the lifecycle.
比如，一颗行星的引力，会使得射电束在靠近时贴近，远离时分开，然后再靠近，就这样处于一种定时变化的节奏中。
The gravitational pull of, say, a planet, will make the radio flashes arrive closer together, then farther apart, then closer, in a regularly changing rhythm.
许多味觉和嗅觉基因显示出选择性压力的迹象，也许反应了当人们的生活从流动到稳定时食物上发生的变化。
Many genes for taste and smell show signs of selective pressure, perhaps reflecting the change in foodstuffs as people moved from nomadic to sedentary existence.
数据仓库和业务智能化环境的一项常见需求是，维护特定时间段内滚动变化的历史数据。
A frequent requirement for data warehouses and business intelligence environments involves maintaining a rolling history of select data over a given period of time.
在amepat运行了较长时间、工作负载频繁发生变化的情况下，这可能有助于找到特定时间的统计数据。
This would be useful to find the statistics for a particular time when amepat is run for long period with workload getting changed frequently.
这一章，你要创建一个简单的球体。包含可以改变颜色和执行一个指定时间周期的平滑变化的文字，如下所示。
In this section, you create a simple sphere with text that changes color and performs a scaling transformation within a specified timeperiod, as shown next.
我们扬升大师正观察着这些变化并确保恰当的结果在当你们的生命合约如此规定时可以被成功地实现。
We Ascended Masters are watching over these changes and assuring that the proper outcome, when so implied by your life contracts, can be successfully reached.
对你的指责、你的工作可能如何变化，以及你的部门或公司目标这一些不确定时会导致压力。
Being unsure about your duties, how your job might be changing, or the goals of your department or company can lead to stress.
在以理想的位周期的百分数表示的同步数据里，用以表示两个峰值间的最大定时变化值。
The maximum peak-to-peak value of the timing variations in synchronous data expressed as a percentage of the ideal bit period.
如果你看到一个文件，得到改变每20 -30秒左右，只是调查你的事件循环的变化，用一个定时器来确保你不太经常的调查。
If you're watching a single file that gets changed every 20-30 seconds or so, just poll for changes in your event loop, with a timer to make sure you don't poll too often.
计算结果表明，在强地震的孕育期，贝纳德花样的周期变化在一定时间后将自动停止。
The results indicate that periodic change of Be'nard patterns after certain time will stop automatically during pregnant period of strong earthquake.
因此，它无法预测出经济不稳定时容易发生的就业市场大幅波动或劳动力供给的突然变化。
Thus its forecasts don't predict the big job-market swings or sudden changes in the supply of workers that can easily happen in a volatile economy.
我现在一个网站的想法和我需要一个定时器被每5秒检查用户没有输入值(如果远程对远程文件的值)变化到一定值时。
I have a website idea at the moment and I need a timer to be fired every 5 seconds without the users input to check if a remote value (a value on a remote file) has changed to a certain value.
在某一特定时间内，有关文件变化的一种记录。
包到达时间的变化，称作抖动，将会由于网络拥塞，定时漂移或路由变更而产生。
Variations in packet arrival time, called jitter, can occur because of network congestion, timing drift, or route changes.
以往对关井恢复中油压的变化趋势预测和分析的方法，不能准确预测油压稳定时间以及稳定油压。
The former method of forecasting and analysis for change of oil pressure at time of build up in closed well can not foresee stable time and oil pressure accurately.
比较两种材料试样在一定时间内的失重变化情况，表明低碳高合金钢的抗冲击腐蚀磨损性能优于高锰钢。
Wear loss of specimens for these two steels during a certain time show that low carbon high alloy steel is much more resistant to corrosive impact abrasion than high manganese steel.
它也有可能是病态的软件程序，以用于其他目的，定时器，计数器和中断率的变化。
It is also possible for an ill-behaved software program to use the timer-counter for another purpose and change the interrupt rate.
结果表明，在起动状态一定时，该系数并非为一个常量，而是介于某个区间，且随颗粒在床面上的相对暴露度的变化而变。
The calculation result indicates that for a given starting condition, the coefficient is not a constant, but varies with the relative exposure degree of grain.
帷幕深度一定时，分析了排水孔深度的变化对渗流量和扬压力的影响。
The effect of increasing drainage depth on seepage discharge and uplift of dam foundation is studied when curtain depth is fixed.
研究了不同配气定时以及不同气门升程工质分层程度的变化规律以及影响因素，对自燃着火区域进行了统计分析。
For different valve timings and valve lifts, the rule and influencing factors of charge stratification were researched and the auto-ignition areas of chamber were statistically analyzed.
该结构通过层次化有限自动机描述系统的控制行为；通过组件网络刻画系统的定时特性，为分析可重构控制器构形的变化提供了有效的手段。
In this architecture, the behavior is described by the HFSM, while the timing feature is described by network of components, which provides effective method to investigating reconfigurable CNC.
讨论了伪抛物方程的一类非线性非局部边值问题，得到了当区域固定时解的存在唯一性，并就当区域变化时解的极限性态进行了探。
The existence and uniqueness of solution are proved when the domain is fixed, and the limit behaviour of solutions is obtained as the domain is changed.
讨论了伪抛物方程的一类非线性非局部边值问题，得到了当区域固定时解的存在唯一性，并就当区域变化时解的极限性态进行了探。
The existence and uniqueness of solution are proved when the domain is fixed, and the limit behaviour of solutions is obtained as the domain is changed.
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