Urea granules are coated with 1% polymer after they are coated with sulfur. Polymer coating makes the SCU coat more flexible and durable.是什么意思_Urea granules are coated with 1% polymer after they are coated with sulfur. Polymer coating makes the SCU coat more flexible and durable.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句