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n.周期（period的复数）
1、perilous───adj.危险的，冒险的
2、periodid───时期
3、periodise───周期
4、periodids───周期
5、periodic───adj.周期的；定期的
6、periosts───骨膜
7、period───n.周期，期间；时期；一段时间；经期；课时；句点，句号；adj.某一时代的
8、perigons───n.三百六十度角，[数]周角
9、pericons───危害
1、In these periods of historic decision, Egypt's leadership was as visionary as it was essential for progress.───在这些历史决策时期，埃及的领导作用不仅关键，而且富有远见。
2、Slight motions of the front northward or southward bring alternating periods of overcast skies and sunshine through the month.───锋面缓慢地向北或向南移动，在这个月内带来阴雨天和晴天的相互交错。
3、The aim is to reduce traffic at peak periods.───目的是缓解高峰期间的交通状况。
4、She went through periods of compulsive overeating.───她发生强迫性暴食有过几个阶段。
5、Watching TV or playing computer games for long periods damages your heart, regardless of how much you exercise, say scientists.───科学家们提醒：不论你平时怎样的运动，长时间的观看电视或玩电脑游戏将对你的心脏造成伤害。
6、Critical periods are also one of the main reasons adults do not recover as well from brain injuries as children do.───这样的关键期也是成年人无法像儿童一样，自脑伤中恢复过来的重要理由之一。
7、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。
8、one good set of results can be dismissed as a fluke, but after two or three bumper periods the share turns into a wonder stock.───好看的单期报表或许只能代表一时的好运，但过了一定阶段，该公司的股票就能变成明星股。
9、The shakeup reflects the sense of crisis within Toyota as it navigates one of the toughest periods in its 70-year history.───这一管理层调整反映出了丰田汽车内部的危机感，这家公司正面临着70年历史上最为艰难的时期。
1、He has had several long periods of work abroad.
2、The sunshine interchanges with periods of light rain.
3、Tomorrow's weather will be cloudy with bright periods.
4、Human prehistory is divided into three successive periods: the Stone Age, the Bronze Age and the Iron Age.
5、In the northwest of China, long dry periods wasted the land.
6、Tomorrow's weather will be dry with sunny periods.
7、He tried to fudge the issue by saying that he did not want to specify periods.
8、Alcoholics often suffer from periods of oblivion.
9、The school day is divided into seven periods.