The reason is that the ultrasonic cleaning only clears up the surfaceimpurity of coatings, while laser conditioning can minimize or restrain the inner defects of coatings.
原因在于超声清洗只能去除表面杂质,激光预处理可减少和抑制膜层内较深处的缺陷。
2
As my friend says: "Being in a relationship just brings to the surface sin and impurity that was already lurking beneath the surface."