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用一块普通的平板玻璃和酒精棉球。挤掉酒精棉球中的多余酒精,然后在洗干净的平板玻璃上涂一层酒精薄膜,对着光线稍加调
Use a regular flat glass and alcohol tampon. Squeeze the excess alcohol in the alcohol swab, then apply a thin film of alcohol on the cleaned plate glass, slightly adjust to the light