【第 2 段建议】: 1. "assurance" should be capitalized as "Assurance." 2. "an hour" should be "per hour." 3. "hope" should be "hopes" to match the subject "They." 4. "to survey the site according to actual needs of customer" should be "to survey the site according to the actual needs of the customer" (missing "the" and "the" before "customer"). 5. "after many considerations, an economical, green and low-consumption sand making plant was configured" should have a semicolon or period instead of a comma before "an economical." 6. "Applications: used for making building aggregates" should be revised for clarity, such as "Applications: It is used for making building aggregates." --- 【第 3 段建议】: 1. 第3段开头处数字“3.”与后文之间应有空格。 2. 第4段中“which based on the field test data”应为“which is based on the field test data”。 3. 第4段中“the operation of plant”应为“the operation of the plant”。