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Labor competition does not stop, a Good indefinitely.
劳动竞赛不停步，创先争优无止境。
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A good quality plasticizer will remain in the plastic indefinitely.
性质优良的增塑剂能无限期地留在塑料内。
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A good quality plasticizer will remain in the plastic indefinitely.
性质优良的增塑剂能无限期地留在塑料内。
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