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。
There were actually two periods of rain and lake formation: the first one began about 37,000 years ago; and the second one dates from about 10,000 years ago.
事实上，这里有两个时期的降雨和湖泊形成：第一个始于大约37000年前；而第二个可以追溯到约一万年前。
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。
For most of the last decade, this trend has been upward, except for the most severe periods of credit crunch.
近十年的大多数时间里，这一趋势是向上的，除了信用危机最为严重的时期之外。
Careful excavation and documentation of layers in a mound can reveal a wealth of information about the everyday life of a people in a settlement over many periods of occupation.
仔细挖掘和记录一个土堆的各个层次，可以揭示出丰富的信息，关于一个民族在许多次占领期在定居地的日常生活的信息。
The symbolism may come from the fact that the olive tree takes a long time to produce fruit, so olives could only be cultivated successfully in long periods of peace.
它的象征意义可能来自于橄榄树需要很长时间才能结出果实，所以橄榄只能在长久的和平时期才能被成功种植。
Years of heavy spring and early summer rains, mild winters, and frequent Atlantic storms, or to periods of droughts, light northeasterly winds, and summer heat waves.
多年的春季和初夏大雨，温和的冬季，频繁的大西洋风暴，或干旱时期，轻微的东北风，和夏季热浪。
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。
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。
She went through periods of compulsive overeating.
她发生强迫性暴食有过几个阶段。
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。
Lengthy periods of economic stagnation or decline have almost always left society more mean-spirited and less inclusive, and have usually stopped or reversed the advance of rights and freedoms.
长期的经济停滞或衰退几乎总是使社会变得更加刻薄、更缺乏包容性，通常还会阻止或逆转权利和自由的进步。
At the same time, both cattle and humans were more confined in their movements, staying much closer to permanent water supplies for long periods of time.
同时，牲畜和人类的行动范围都受到了更大的限制，在很长一段时间内都要待在离永久水源更近的地方。
Many come through periods of stress with more physical and mental vigor than they had before.
许多人在经历了一段时间的压力后，身心都比以前更有活力。
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。
Sitting in one position for long periods of time is nor healthy.
长时间保持一种姿势并不健康。
It'll have to operate for long periods of time in very cold temperatures.
它必须长时间在非常低的温度下运行。
In the wild, these birds store food for retrieval later during periods of food scarcity.
在野外，这些鸟会储存食物以备日后食物短缺时再取用。
Afghanistan was a founding member of the confederation in the 1950s before entering long periods of war and factional fighting.
在进入长期战争和派系斗争之前，阿富汗在20世纪50年代是该联盟的创始成员国。
It was discovered that long periods of home-working even caused backache.
人们发现，长期在家中办公甚至会引起背痛。
Certainly there are memory consolidation processes that occur across periods of wakefulness, some of which neither depend on nor are enhanced by sleep.
当然，在清醒状态下也有记忆巩固的过程，其中一些既不依赖睡眠，也不被睡眠增强。
Certainly, there are memory consolidation processes that occur across periods of wakefulness, some of which neither depend on nor are enhanced by sleep.
当然，有一些记忆巩固过程发生在清醒期，其中一些既不依赖于睡眠，也不因睡眠而增强。
Interglacial periods are, typically periods of time between Ice Ages, when the climate warms, and the glacial ice retreats for a time, before things cool off again and another Ice Age begins.
间冰期通常是在冰期之间的一段时间，这时气候变暖，冰川的冰会暂时消退，直到气候再次变冷，下一个冰期开始。
We haven't considered how we should study over very short periods of time.
我们还没有考虑过如何在很短的时间内学习。
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。
Ancient fresh water green algae must have evolved features that enable them to withstand extremes of temperature and periods of dryness.
古老的淡水绿藻一定进化出了一些特性，这些特性使得它们能够熬过极端的温度和干旱期。
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。
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。
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