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one day the little girl meet the old man along the side walk.the little girl asked
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| can you evaluate colloids in your daily life? | |
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| yes,my darling colloid is helpful to us, we always encounter them everyday.. | |
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| can you give example to them? | |
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| of course yes,such as aerosols ,food products ,and beauty products. | |
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| but,some products of colloids can pollute our environment. | |
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