The aim is to reduce traffic at peak periods.

目的是缓解高峰期间的交通状况。

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。

She went through periods of compulsive overeating.

她发生强迫性暴食有过几个阶段。

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。

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。

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。

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。

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。

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。

They accompanied him during his exercise periods.

在他的练习时段，他们都陪着他。

I used to write during my free periods at school.

我过去上学时常在空闲时间写作。

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。

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。

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。

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。

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 letters show China's development in different periods.

这些信展示了不同时期里中国的发展。

They can not live for long periods in cold weather.

它们不能在寒冷的天气中长时间生存。

People often start counting "nine cold periods" starting from winter solstice.

人们通常从冬至开始计算“九个寒冷期”。

Blink your eyes at regular periods to keep your eyes moist.

定期眨眼以保持眼睛湿润。

Being lonely for long periods of time is not a great feeling.

长时间的孤独并不是一种好感觉。

I think it is one of the most wonderful periods in my life.

我认为它是我生命中最美好的一段时光。

These muscles become stronger, allowing the whales to dive for longer periods of time.

这些肌肉变得更强壮，使得鲸鱼潜水的时间更长。

Connecting flights usually require longer periods of flying and planes will use more energy.

转机航班通常需要更长的飞行时间，飞机会消耗更多的能源。

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。