1 a length of time (一段)时间,时期:
The scheme will be introduced for a six-month trial period.这个方案将有六个月的试验期。Her son is going through a difficult period at the moment.她的儿子目前正经历一段艰苦的时期。What period of history are you most interested in?你对哪个时期的历史最感兴趣?
2 a lesson in school (学校里的)一节课,一堂课:
We have five periods of English a week.我们每星期有五节英语课。
3 the time every month when a woman loses blood from her body (妇女的)月经