those sealed toxic chemical substances and related articles that have been determined to be appropriate for the making of improvements or conversion into other substances shall be unsealed and returned to the handler and the handler shall be supervised in making improvements or performing conversion within a limited period
经密封处理的有毒化学物质和有关物品，经确定适合改进或者转化为其他物质的，应当开封交还处理人，并监督处理人限期改进或者转化
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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