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1. The building was constructed using a mixture of different types of stone.
这座建筑使用了不同类型石头的混合物建造。
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2. The engineer carefully analyzed the data to identify any potential risks associated with the use of this material.
工程师仔细分析了数据，以识别与使用这种材料相关的任何潜在风险。
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3. The company has been working on developing new materials that are more environmentally friendly.
该公司一直在开发更环保的新型材料。