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。

The reason is that the ultrasonic cleaning only clears up the surface impurity of coatings, while laser conditioning can minimize or restrain the inner defects of coatings.

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注入维生素，抗氧化剂和其他植物润肤剂，它中和表面杂质和带来所需要的水分，你的脸。

Infused with vitamins, antioxidants, and other plant emollients, it neutralizes surface impurities and brings needed moisture to your face.

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本文叙述了在HT - 6b托卡马克装置上，采用脉冲放电清洗去除真空室壁表面杂质的初步实验结果。

This paper describes the experiment results on removing impurities from vacuum wall by means of pulse discharge cleaning in the HT-6B Tokamak device.

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