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1.The engineer graded the materials according to their strength.
工程师根据材料强度对其进行了分级。
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2. The company has developed a graded aggregate system for its construction projects.
该公司为其建设项目开发了一种分级集料系统。
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3.The graded aggregates are used in road construction to improve drainage and stability.
分级集料用于道路建设，以改善排水和稳定性。