Just as business domains differ, so do their domain models, persistent or not.

业务领域各不相同，所以它们的领域模型和持久化方式也可能不同，但也有相同之处。

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So, this raises the question: how does one go about ensuring that /dev/mouse or /dev/cdrom symlinks not only exist, but are persistent across reboots?

因此，这就产生一个问题：人们怎么确保 /dev/mouse 或 /dev/cdrom 符号链接不仅存在，而且在重新引导系统之后它还是存在的呢？

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Older children and adults who have whooping cough often appear to have a bad cold or persistent cough that can be so severe that it causes vomiting.

CNN: Can breast-feeding prevent whooping cough?

For instance, cholesterol drugs are so good at preventing second heart attacks that giving them to people who have had heart attacks or persistent chest pain might save money.

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