英语翻译句子如下：The DJ-UBS Commodity Index returned -1.5% in Octobe

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/28 06:33:10

英语翻译
句子如下：
The DJ-UBS Commodity Index returned -1.5% in October,with YTD returns yielding -9.9%.
我实在是不明白为什么return的后面接了一个负数百分比,这到底是回升了还是下降了?哪位懂金融方面的朋友麻烦帮我详细解释一下怎么翻,为什么这么翻,我学习一下,

瑞银商品指数与10月同比下降了10%,年初至今的回报下降了9.9%
再问：那为什么明明是下降了，还要用“回升负数”这一奇怪的表达方法呢？我发现不止是道琼斯，高盛指数也会这么用。请问是为什么？

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