符号可以以数字方式删除或保存。
实现这一点的方式是删除默认值，确保仅在严格要求时才提供它们。
The way to achieve this is to remove the default values, ensuring that they are only provided when strictly required.
灵活性：可以用简单的方式增加、删除和修改断言模块。
Flexibility: Assertion modules can be added, deleted, and modified in a simple fashion.
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