Useless wrapping accounts for much of the refuse put out by the average London household each week.

【专家解说】：1楼翻译完全正确！ 这是一个unless引导的条件状语从句 其中： wrapping 主语 accounts for 谓语 意思是 占据...比例 much of the refuse 宾语 put out by the average london household each week 过去分词作定语，修饰宾语