以下为句子列表：
英文: One set of securities, known as an equity tranche, pays the highest returns but is the first to suffer if the underlying bonds default; other securities offer a much lower yield but a triple-A credit rating, because a lot of defaults would be needed to tr
中文: 其中一套被称为“平等分额”可享受最高回报，但同时，如果优先债券欠债，这种债券也将首先遭受损失；其他一些债券，虽为3A级，但收益较低，因为引起损失的是大量的欠债。
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