名词
中文翻译：冬季等级
同义词：
['winter semester', 'winter term']
例句：
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1.The school has a winter grade system for students to prepare for the next academic year.
学校有一个冬季年级系统，让学生为下一年的学习做准备。
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2. The winter grade is typically harder than the summer one because of the shorter study period.
冬季年级通常比夏季的难，因为学习时间较短。
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3. Students are expected to complete their winter grade work before the end of the semester.
学生被期望在学期结束时完成他们的冬季年级工作。