名词
中文翻译：分级卷筒
同义词：
['grade roll', 'grade roller']
例句：
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1.The grader is used to sort and classify documents.
分级机用于对文档进行分类和排序。
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2. The grader was designed to improve the efficiency of the printing process.
分级机旨在提高印刷过程的效率。
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3.The grader has become a popular tool for document management in many offices.
分级机已成为许多办公室中文档管理的一种流行工具。