【第 1 段建议】: 1. "lmpact" should be "Impact" (the lowercase 'l' should be an uppercase 'I'). 2. "sand production lin" should be "sand production line" (missing 'e' at the end). --- 【第 2 段建议】: 1. "Jaw crusher" should be capitalized as "Jaw Crusher" for consistency. 2. "machine-made sand" should be "machine-made sands" for agreement with "material." 3. The phrase "made from sand and gravel production line" is unclear; it should be "made from the sand and gravel production line." 4. "ordinary hammer sander" should be "ordinary hammer sanders" for consistency with plural. 5. "Building quality" is a fragment and should be rephrased or connected to the previous sentence for clarity. 6. "fine crushing jaw crusher" should be "fine crushing Jaw Crusher" for consistency. 7. The sentence "The feed port width is smaller than 300MM is a small machine." is grammatically incorrect; it should be rephrased, e.g., "The feed port width smaller than 300MM is considered a small machine." 8. The text ends abruptly with "ha", which seems to be an incomplete word. Please make these corrections for improved clarity and accuracy. --- 【第 3 段建议】: 1. "WhatsApp" appears multiple times – it should be consistent (remove one instance). 2. "Demand(multiple):" should have a space before the parentheses: "Demand (multiple):". 3. The word "Demand" is capitalized unnecessarily in "Demand(multiple):". 4. The item "Materials (brochures, catalogs）" uses a non-standard closing parenthesis (）) instead of the standard closing parenthesis ()). Other than these issues, the text is free of spelling, singular/plural, and punctuation errors.