Six times and four times
以上为机器翻译结果，快速获取精准的人工翻译结果，建议选择有道人工翻译
six sealing and four closing
... 封面/封四 front/back cover 六封四闭 six sealing and four closing 苯封四聚苯胺 Phenylcapped aniline tetramer ...
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