period
period
noun
put a period to
noun
- a length or portion of time
（一段）时间，时期，阶段
he had long periods of depression.
他几次陷入长时间的消沉。
the ale will be available for a limited period.
麦芽酒只供应有限的一段时间。
the period 1977–85.
从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
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
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 - (Physics)the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon, such as a mechanical vibration, an alternating current, a variable star, or an electromagnetic wave
(物理)（振动或循环的）周期
■(Astronomy)the time taken by a celestial object to rotate about its axis, or to make one circuit of its orbit
(天文)自转（或公转）周期
■(Mathematics)the interval between successive equal values of a periodic function
(数)（周期函数的）周期 - (亦作 menstrual period)a flow of blood and other material from the lining of the uterus, lasting for a few days and occurring in sexually mature women who are not pregnant at intervals of about one lunar month until the menopause
（妇女的）经期 - (chiefly N. Amer.)a full stop
(主北美)句号，句点
■(informal)added to the end of a statement to indicate that no further discussion is possible or desirable
(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）
he is the sole owner of the trademark, period.
他是那商标的唯一所有人，就是这样。 - (Chemistry)a set of elements occupying a horizontal row in the periodic table
(化)周期元素 - (Rhetoric)a complex sentence, especially one consisting of several clauses, constructed as part of a formal speech or oration
(修辞)完整句
■(Music)a complete idea, typically consisting of two or four phrases
(乐)乐段，乐节
- [attrib.]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
a splendid selection of period furniture.
古老家具精选。
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。
- late Middle English (denoting the time during which something, especially a disease, runs its course): from Old French periode, via Latin from Greek periodos 'orbit, recurrence, course', from peri- 'around' + hodos 'way, course'. The sense 'portion of time' dates from the early 17th cent
考试词汇表
