half-period zone

例句：

1. 1. The teacher explained theconcept of half-period zone in detail.
   老师详细解释了半期区的概念。
2. 2. Duringthe exam, students were required to staywithin the half-period zone.
   考试期间，学生被要求待在半期区内。
3. 3.The school has designated a specific area forstudents to use during the half-periodzone.
   学校为学生在半期区内使用指定了特定区域。