在普通的类别层次结构中，同一父类的兄弟类别之间的混淆关系是对称的，但事实上类别之间的混淆关系不是对称的。

In the general hierarchical structure, confusion relationship among brother classes that have the same parent class is symmetrical. But in fact that's not the case.

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他表示，2008年9月雷曼兄弟(Lehman Brothers)倒闭后，中国把大量资金投向了美国国债，目前，中国可能真的已开始调整外汇储备结构，减持这种资产类别。

China may have indeed started to rebalance its foreign reserve portfolio from US Treasuries, he says, having piled into the asset class after the collapse of Lehman Brothers in September 2008.

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如何从一个目标和兄弟元素删除类别？

How to target and remove class from a sibling element?

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