一段时间：指一段被用于计时或历史学目的的时间跨度，如某个君主统治时期的纪元，某个特定日历使用的纪元，或者地球历史上定义的地质纪元。
an amount of time
同义词： time period / period
时段-引用次数：10
参考来源宫颈癌多层CT增强扫描的时相分析
时段-引用次数：14
参考来源“统一战线”政策下的“整合”
期间
... 6、年 [year] 7、指某一时期、某一时刻 [period of time] 甲骨文 dōng ...
... period of time 一段时间；时段 long period 长期的；长周期 short period adj. 短周期的；短过期的 ...
（a）出场一段时间（period of time）：任何因重复犯规被罚令出场或因犯规而需要加重处罚的队员将要离开赛场呆在与该队进攻得分线对应的中间的位置并且不得靠近得分线...
... Lu bicz）的分析，希罗多德绕了个大圈子，想要传达（或许说的不是那么伶俐）给我们的讯息是一种「时间周期（period of time）的概念。所谓「时间周期，就是春分时的日出，以星座为背景，环绕黄道带（十二宫）一圈半的期间。
All these changes happened over a period of time.
所有这些变化都是在一段时间内发生的。
This crisis might last for a long period of time.
此次危机可能会持续很长一段时间。
She spent a period of time working with people dying of cancer.
她用一段时间帮助即将死于癌症的人们。
Medical experts say small amounts of carbon monoxide over a long period of time can greatly harm an unborn baby.
VOA : special.2010.02.02
It began to infiltrate other disciplines and was in general a high-spirited horse for that certain period of time.
它逐渐渗入到其它学科,总之是那个时代的一匹黑马。
文学理论导论课程节选 : 耶鲁公开课
There was a period of time in which, although there were decent, chess-playing programs couldn't beat the best chess-playing humans.
尽管曾一度出现过,强劲的象棋程序,无法战胜顶级人类棋手的情形
死亡课程节选 : 耶鲁公开课
"I think Dubai went a little bit too fast and they borrowed too much money in a very short period of time."
VOA : special.2009.12.04
Others who want to graduate in three years must pay for the same education as four-year students, but in a shorter period of time.
VOA : special.2009.07.23
There was a period of time when there wasn't much emphasis put on antibiotics.
There have been periods when Congress has done even more in that period of time.
They will also be dismissed from their jobs for a period of time .
CENTERFORSECURITYPOLICY: Peru��s reaction to Venezuelan intervention