1. periods of artistic involution.
   艺术错综复杂时期。
2. the boom and slump periods of a trade cycle.
   贸易盛衰循环。
3. he had long periods of depression.
   他几次陷入长时间的消沉。
4. transitory periods of medieval greatness.
   昙花一现的中世纪辉煌时期。
5. during the periods of menstruation
   在月经期间
6. bouts of depression alternate with periods of elation.
   经济繁荣期和萧条期的交替出现。
7. it's a good idea to block in regular periods of exercise.
   安排固定的锻炼时间是个好主意。
8. periods of often violent short-run price volatility.
   价格常剧烈波动的时期。
9. he was a light sleeper, for long periods an insomniac.
   他睡眠不好，长时间失眠。
10. one of the most difficult periods of her life;
    她生命中最困难的时期；
11. Long dry periods wasted the land.
    长期的干旱使土地荒芜。
12. He's only away for short periods, a week at the longest.
    他只是短期外出, 最多一周。
13. whole periods of time are elided into a few seconds of screen.
    整个时期被压缩为屏幕上的几秒钟。
14. long fallow periods when nothing seems to happen.
    似乎不会发生任何事情的漫长而沉闷的时期。
15. prescribed drugs to control the patient's periods of mania.
    开药方来控制病人的躁狂的阶段。
16. One problem with this classification is that even classic homeotherms experience periods of reduced temperature.
    这种分类的一个问题是，即使是典型的恒温动物也经历了降低体温的时期。
17. Life often seems to be marked off into different periods: schooldays,marriage,old age.
    生命似乎分为三个不同时期：学生时代,结婚,老年。
18. The first of these glacial periods is often called the Huronian glaciation because it is well exposed in rocks just north of Lake Huron in southern Canada.
    第一次冰期称为「休伦冰期」，因其遗迹在加拿大南部休伦湖北方的岩石中清晰可见。
19. The function equilibrium models were successful in the simulation of the root/canopy ratio at the periods of the vegetative growth, but were poor to simulate portioning among other organs.
    源汇关系模型机理性最强，可模拟任何器官间的同化物分配，应用范围最广泛。Childhood is a period of rapid growth.
    幼年是生长迅速的时期。
20. This is a dynamic period in history.
    这是历史上最有生气的时代。
21. Chaucer wrote in the late mediaeval period.
    乔叟写作的时代是中世纪末。
22. Adolescence is the period of transition between childhood and adulthood.
    青春期是童年与成年之间的过渡时期。
23. Karen carefully calculated the period when she was most fertile.
    卡伦仔细地计算了自己的最佳受孕期。
24. There was always a honeymoon period when Mum started a new job.
    妈妈每开始一份新工作总会有一阵儿新鲜劲。
25. His war poetry struck a chord with people who remembered that period.
    他的战争诗歌引起了对那个时代存有记忆的人的共鸣。
26. The athlete could face a lengthy period of suspension if found guilty.
    如果被判有罪，这名运动员可能面临长期停赛。
27. The headmaster seems to be a fixture in the school for quite a long period.
    校长似乎固定在这个学校工作很长一段时间了。
28. How long is its latent period?
    它的潜伏期有多长?
29. Long dry periods wasted the land.
    长期的干旱使土地荒芜。
30. This period was the hightide of Romanticism.
    这是浪漫主义的颠峰时期。
31. He excels all other composers of his period.
    他胜过同时代的所有其他作曲家。
32. A bell signals the end of a school period.
    铃声报知下课的时间。
33. The adolescent period is one's best time.
    青少年时期是一个人最美好的一段时光。
34. His encouragement buoyed her up during that difficult period.
    他的鼓励使她在那段困难时期恢复了乐观的情绪。
35. Britain was a Roman dependency for a long period.
    英国有很长一段时间是罗马的属地。
36. His period corresponds to the floruit of Classical Greece.
    他所统治的时期，正是古希腊的全盛时期。
37. The store will be closed for an indefinite period.
    这家商店将无限期关闭。
38. During this period all the students were actively participating.
    在这节课中所有的学生都积极参加。

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