【第 2 段建议】: 1. "sen" 应为 "sent" (拼写错误) 2. "T-typed" 应为 "T-type" (拼写错误) 3. "30-40%" 的百分号前应加空格，如 "30 - 40%" (标点建议) 4. "7%" 的百分号前应加空格，如 "7 %" (标点建议) 5. "15 days." 应为 "15 days." (标点一致性) 请考虑这些更改以提高文本的准确性和可读性。 --- 【第 3 段建议】: 1. "moisture of material" should be "moisture of the material". 2. "technology of grinding by pressure" should be "technology of grinding under pressure". 3. "to for the sound development" should be "for the sound development". 4. "customer's problems is the key wining" should be "customer's problems is the key to winning". 5. "some customer would import" should be "some customers would import". 6. "it is much cheaper and can increase alternatives" should be "it is much cheaper and can increase the alternatives".