【第 3 段建议】: 1. "coarse aggregate, others as fine aggregate" 应为 "coarse aggregate, and others as fine aggregate"（缺少连词“and”）。 2. "high-quality aggregate;" 应为 "high-quality aggregates;"（应使用复数形式“aggregates”）。 3. "The customer company is engaged in green buil" 应为 "The customer company is engaged in green building."（“buil”拼写错误，应为“building”）。