名词
中文翻译：分级筛子
同义词：
['grading screen', 'sorting sieve']
例句：
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1.The graded sieve is used to separate the grains by size.
分级筛用于按大小分离谷物。
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2. The farmer used a graded sieve to separate the wheat from the chaff.
农民使用分级筛将麦子和麦壳分开。
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3.The engineer designed a graded sieve to improve the efficiency of the sorting process.
工程师设计了一种分级筛，以提高分类过程的效率。