@stvvice
A glass of water for drip a drop of sewage and dirty, a cup of water is not clear because of the existence of a drop of wate一杯清水因滴入一滴污水而变污浊，一杯污水却不会因一滴清水的存在而变清澈。
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A glass of water for drip a drop of sewage and dirty, a cup of water is not clear because of the existence of a drop of wate一杯清水因滴入一滴污水而变污浊，一杯污水却不会因一滴清水的存在而变清澈。
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