The results indicate no impurity accumulation after the analysis of the recovered solution which was circularly used for 50 times.
对经过50次循环使用的回收液进行分析，未见杂质积累现象。
The results indicate no impurity accumulation after the analysis of the recovered solution which was circularly used for 50 times.
对经过50次循环使用的回收液进行分析，未见杂质积累现象。
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