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。
They had undoubtedly made progress in the six years that separated the two periods.
他们无疑在那两个时期之间的6年里取得了进步。
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。
It is difficult to make oneself concentrate for long periods.
让自己长时间聚精会神是很困难的。
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。
Traffic congestion is really bad at peak periods.
交通拥挤状况在高峰时段真是糟糕透了。
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。
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。
March is one of the peak periods for our business.
三月是我们公司业务最繁忙的时期之一。
The duration of previous geologic periods was difficult to determine.
以前很难确定地质期的持续时间。
Many people pass through periods of difficulty in sleeping and eating.
许多人都会经历睡眠和饮食困难的时期。
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。
In wet periods, the land may be able to respond to these stresses.
在湿润时期，土地可能会对这些压力作出反应。
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。
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。
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。
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。
The players have comparatively long periods of inactivity.
这些运动员有相当长的一段时间会无所事事。
I used to write during my free periods at school.
我过去上学时常在空闲时间写作。
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。
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