名词
中文翻译：标记类
同义词：
['classification', 'category']
例句：
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1.The teacher marked the exam papers with a red pen.
老师用红笔批改试卷。
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2.The student has to mark his homework before it is due.
学生必须在作业到期前完成并标记。
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3.Marking classes are held every Wednesday afternoon in the school library.
每周三下午在学校图书馆举行标记课。