名词
中文翻译：一半的时期
同义词：
['quarter', 'half-hour例句：1. During the half-period', 'we studied geometry.（在半个时段，我们学习了几何。）']
例句：
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1. During the half-period, we studied geometry.
在半个时段，我们学习了几何。
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2. The teacher gave a half-period lecture on history.
老师在半个时段对历史进行了一次演讲。
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3.After the half-period, students had to take a break.
半个时段后，学生们需要休息一下。