【第 1 段建议】: 1. "Vertical Shaft lmpact Crusher" - "lmpact" should be corrected to "Impact". 2. "EPCO" - The context is unclear; if this is an abbreviation, maintain as is; otherwise, it may need clarification or expansion. 3. "Truck Unloader" - Consider changing to "Truck Unloaders" for consistency with plural formatting in that section. 其他段落没有发现拼写、单复数和标点错误。 --- 【第 2 段建议】: 1. "Summary："中的冒号应为"Summary:"，去掉多余的空格。 2. "These sand making machines are designed to transform a variety of raw materials, including rocks, quarried stone, and recycled construction waste"中，"machines"应为单数"machine"以保持与前文的单数一致。 3. "the input material into cubical, well-graded sand particles"中的"cubical"应该改为"cubical"，因为这是一个拼写错误。 4. "delivering a consistently high-quality sand product"中的"product"可以考虑使用复数"products"来与前文上下文保持一致性，虽然在此上下文中单复数不影响理解，但更改能减少潜在的歧义。