His painting went through both representational and abstract periods.
他的绘画风格经历了具象和抽象两个阶段。
The aim is to reduce traffic at peak periods.
目的是缓解高峰期间的交通状况。
They accompanied him during his exercise periods.
在他的练习时段，他们都陪着他。
The workload can be evened out, instead of the shop having busy times and slack periods.
工作量可以均衡分配，商店就不会有旺季和淡季。
The letters show China's development in different periods.
这些信展示了不同时期里中国的发展。
I started playing when I was nine years old, and football got me through difficult periods.
我从九岁开始踢球，足球帮助我度过了困难时期。
You should avoid riding during weekday rush periods.
你应该避免在工作日的高峰时段骑车。
You need to avoid riding during weekday rush periods.
你要避免在工作日高峰时段骑车。
Give yourself the resources to be tough by creating internal and external recovery periods.
通过建立内部和外部恢复期，为自己变强提供动力。
If you're trying to build resilience at work, you need adequate internal and external recovery periods.
如果你想在工作中培养复原力，就需要充分的内外部恢复时间。
Over the past two million years, colder glacial periods have alternated with warmer interglacial periods.
在过去的200万年里，寒冷的冰期与较暖和的间冰期交替出现。
High carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.
高二氧化碳含量与温暖的间冰期有关，低二氧化碳含量与寒冷的冰期有关。
Recent studies do in fact show that high carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.
最近的研究确实表明，高二氧化碳水平与温暖的间冰期有关，而低二氧化碳水平与寒冷的冰期有关。
Fossils are thus identifying markers for particular periods in Earth's history.
因此，化石是识别地球历史上特定时期的标志。
During the sun's violent periods, it throws off charged particles in fast-moving strings called solar winds.
在太阳活动剧烈的时期，它会释放出带电粒子，形成快速移动的弦，被称为太阳风。
During the sun's violent periods, it throws off charged particles in fast moving strings called solar winds.
在太阳活动剧烈的时期，它会释放出带电粒子，形成快速移动的弦，称为太阳风。
While such repression may occur, people cannot remember ordinary events from the infant and toddler periods either.
这种压抑可能发生，但人们也同样不记得婴儿和学步期的普通事件。
Learn to know the different periods of foods and know how to cook them in the right way.
学习了解食物的不同阶段，并知道如何正确烹调它们。
Slow, continuous change may be the norm during periods of environmental stability, while rapid evolution of new species occurs during periods of environment stress.
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。
Although change in carbon dioxide content closely follows change in temperature during periods of deglaciation, it apparently lags behind temperature during periods of cooling.
虽然在冰川消退期间二氧化碳含量的变化与温度的变化密切相关，但它显然滞后于冷却期间的温度。
During periods when commodity prices were high, the rate of westward migration increased spectacularly.
在商品价格较高的时期，西迁的速度大幅增长。
Astronomical cycles have an effect on Earth's climate even during periods when there is no glaciation.
即使在没有冰川的时期，天文周期也会对地球的气候产生影响。
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。
Earth was already in one of its warm interglacial periods when we started burning fossil fuels.
当我们开始使用化石燃料时，地球已经处于温暖的间冰期之一。
She went through periods of compulsive overeating.
她发生强迫性暴食有过几个阶段。
During the past few years the university has staggered the summer holiday periods for students.
在过去几年里该大学已经把学生的暑假时间错开了。
There were periods of sulking, of pronounced distance, of coldness.
出现阶段性的愠怒、明显的疏远和冷淡。
There it remains, sometimes for long periods, before emerging at the surface again.
在那里，地下水在重新涌出地表之前，往往可以保存很长一段时间。
Pioneer and successional plant communities are said to change over periods from 1 to 500 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。
Local adaptations and evolution over long periods of isolation promoted fascinating species adaptations to local conditions.
在长时间的隔离状态下，地方适应性和进化促进了绝佳的物种适应当地的环境。
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