玻璃表面：不允许有擦不掉的脏污，直径0.5mm 以下杂质少于20 个且

玻璃表面：不允许有擦不掉的脏污，直径0.5mm 以下杂质少于20 个且不能连续分散，不能为黑色

ผลลัพธ์ (อังกฤษ) 1:

Glass surfaces: wipe off stain are not allowed, diameter 0.5mm impurities of less than 20 and cannot be dispersed in a row, not to black

ผลลัพธ์ (อังกฤษ) 2:

Glass surface: not allowed indelible dirt, impurities less than 0.5mm in diameter and not less than 20 consecutive dispersed, not to black

ผลลัพธ์ (อังกฤษ) 3:

Glass surface: do not allow a wipe off dirt, diameter 0.5mm impurity less than 20 and not continuous dispersion, not black