名词短语
中文翻译：数量的时期
同义词：
['periods', 'number of times']
例句：
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1. The teacher asked us to countthe number of periods we had missed.
老师让我们数出我们错过的课时。
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2.We need to plan our schedule carefully toensure we have enough time for each numberof periods.
我们需要仔细规划我们的日程，以确保我们有足够的时间来应对每一个课时。
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3. The project requires a team of expertswho can work on multiple number of periods.
这个项目需要一支专家团队，他们可以处理多个课时。