名词
中文翻译：质量分级
同义词：
['qualitative analysis', 'qualitative differentiation']
例句：
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1.The company is conducting a quality gradation of its products to ensure customer satisfaction.
该公司正在对其产品进行质量分级，以确保客户满意度。
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2. The research team conducted a qualitative gradation of the data to identify patterns and trends.
研究团队对数据进行了定性分级，以识别模式和趋势。
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3.The teacher used qualitative gradation to help students understand the concept of probability.
老师使用定性分级帮助学生理解概率的概念。