求翻译：The content of C_5 was strictly limited in butadiene extraction unit using dimethylformamide(DMF) process.Higher content of C_5 could cause a lot of problems such as blockage of equipment and disqualification of product which would affect long period operation of the unit.Based on the practical production this paper analyzed the influence of high content of C_5 in raw material for the unit and put forward corresponding countermeasures是什么意思？

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