【第 1 段建议】: 发现的问题： 1. "Vertical Shaft lmpact Crusher" 中的 "l" 应为大写 "I"。 2. "High Weir Spiral Classifier" 和 "Submerged Spiral Classifier" 中的两个空格应为一个。 --- 【第 2 段建议】: 1. "1Stone" 应为 "1 Stone" 2. "and How to Choose the Best?" 中的问号应为不大写的 "best?" 3. "6Silica" 应为 "6 Silica" 4. "Equipments" 应为 "Equipment"（Equipment 为不可数名词） 5. "Six reasons of vibrating screen" 应为 "Six reasons for vibrating screen" 6. "2020-06-12" 和 "2020-06-11" 和 "2020-06-04" 和 "2020-06-03" 应用逗号或分号与前文区分 7. "Driven by the demand of aggregates market in recent year" 应为 "recent years" 8. "the mobile crusher gradually develops from the extensive mode to the refinement development" 应为 "refined development" 9. "common mistake in purchasing sand making machine?" 应为 "sand making machines?" 请参阅以上问题以进行修改。 --- 【第 3 段建议】: 1. "plays a special roles" - should be "plays a special role" 2. "the other three factors affect the bearing vibration" - should be "the other three factors affecting the bearing vibration" 3. "the vibration of bearing" - should be "the vibration of the bearing" --- 【第 4 段建议】: 1. "In recently" should be "Recently". 2. "singlesand maker" should be "single sand maker". 3. "sand-making system" should be consistent with the previous term, either "sand-making system" or "sand making system". 4. "output of sand making machine" should be "output of sand making machines" for plural consistency. 5. "the rapid development of infrastructure" could be clearer as "the rapid developments in infrastructure" to imply multiple aspects. 6. "One is natural sand, and the other is manufactured sand" should have "one" and "the other" in lowercase for consistency. 7. "Raymond mill is one of the necessary equipment" should be "Raymond mill is one of the necessary pieces of equipment". 8. "Sand making machine is a device specifically for crushing the hard ore or extremely hard ore materials" should be "Sand making machines are devices specifically for crushing hard ores or extremely hard ore materials" for plural consistency and clarity. 9. "the impact crusher machine ordered and used in the actual production line" should be "the impact crusher machine is ordered and used in the actual production line" for grammatical correctness. 10. "WhatsApp" is used inconsistently; it should be lowercase as "WhatsApp". 11. "Materials (brochures, catalogs）" has a mismatched closing parenthesis; it should be "Materials (brochures, catalogs)".