为了匹配多个证书，这些 OU 字段必须跨证书保持一致并按同一顺序显示。
In order to match multiple certificates, these OU fields must be consistent across certificates and appear in the same sequence.
选项指明其中一个字段必须按降序排列。
The [d] option indicates that one of the fields must be sorted in descending order.
换句话说，数据字段必须包含有效数据等。
In other words, a data field must contain valid data, and so on.
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