词典释义：
a length or portion of time
（一段）时间，时期，阶段
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he had long periods of depression 他几次陷入长时间的消沉
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the ale will be available for a limited period 麦芽酒只供应有限的一段时间
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the period 1977—85 .１９７７—１９８５年这一时期。
a portion of time in the life of a person, nation, or civilization characterized by the same prevalent features or conditions
阶段；时代
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the early medieval period .中世纪的早期。
one of the set divisions of the day in a school allocated to a lesson or other activity
学时，课时。
[with modifier]a set period of time during which a particular activity takes place
周期，期
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the training period is between 16 and 18 months .训练期是１６到１８个月。
each of the intervals into which the playing time of a sporting event is divided
（体育比赛的）局。
a major division of geological time that is a subdivision of an era and is itself subdivided into epochs, corresponding to a system in chronostratigraphy
（地质年代划分的）纪。
【物理】 （振动或循环的）周期。
【天文】 自转（或公转）周期。
【数】 （周期函数的）周期。
(亦作
（妇女的）经期。
〈主北美〉 句号，句点。
〈非 正式〉 到此为止，就这样（常用于陈述末尾，表示无法或无需再讨论）
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he is the sole owner of the trademark, period .他是那商标的唯一所有人，就是这样。
【化】 周期元素。
【修辞】 完整句。
【乐】 乐段，乐节。
belonging to or characteristic of a past historical time, especially in style or design
（尤指风格或设计）属于过去某一特定历史时期的；具有过去某一特定历史时期特点的
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a splendid selection of period furniture .古老家具精选。
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put a period to dated put an end to; bring to a conclusion 〈旧〉 使结束，终止in dry climates, the onset of summer drought may put a period to plant activity .在干燥的气候条件下，夏季干旱的开始就可能使植物丧失活力
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in a short period of time 短期内
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during the period 在此期间
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over a long period of time 很长一段时间
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period of history 历史时期
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the Spring and Autumn Period 春秋战国时期
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"late Middle English （denoting the time during which something, especially a disease, runs its course）： from Old French
