【第 1 段建议】: 1. "factors" 应为 "Factors" （首字母应大写）。 2. "affect" 应为 "affects" （主谓一致，需用单数形式）。 3. "Raymond mill" 应为 "Raymond Mills" （应使用复数形式，前文中提到的是“a small Raymond mill”，这里不宜使用单数）。 4. "lmpact" 中的字母 "l" 应为 "I" （应为 "Impact"）。 --- 【第 2 段建议】: 1. "factors affect price of a small Raymond mill" → "factors affecting the price of a small Raymond mill" 2. "steel castings is different" → "steel castings are different" 3. "the circulation in the market" → "the small Raymond mills circulating in the market" (to maintain parallel structure) 4. "can not" → "cannot" 5. "the production strength of different manufacturers is different" → "the production strength of different manufacturers varies" (for more concise wording) 6. "some manufacturers have independent production capacity, and can carry out research and development" → "and they can carry out research and development" (to avoid repetition) 7. "without actual factory buildings, can not achieve equipment production, relying on price increases" → "without actual factory buildings, cannot achieve equipment production and rely on price increases" (to correct the structure)