Photoshop 6.0实用培训教程--水电知识... ... 清除杂点效果（Despeckle） 灰尘和划痕（Dust&Scratches） 中值滤镜（Median） ...
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光学元件损伤是主要由于强激光的非线性效应而导致，损伤包括表面损伤点、内聚焦丝，灰尘和划痕等。
Optics damage is mainly caused by the nonlinear effect of high laser, the damage of large optics includes the surface damage dots, interior focalized filaments, dust, scratches and so on.
这也包括划痕，排气烧伤，灰尘和其他良好的自然力，发挥了在直升机生命的一部分。
This also includes scratches, exhaust burns, dust and other good forces of nature that has played a part in the helicopters life.
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