However, they require extremely fine temperature adjustments since even slight overheating results in discoloration and irreparable damage to the polycondensate product.

• 但这样的工艺往往要求非常苛刻的温度控制和调节，因为稍微过热就会导致缩聚产品的色泽加深而超标甚至造成其他的致命影响。