Listing 4 shows the use of the kernel attribute that is automatically injected into the class that defines the life cycle code.
清单4显示了kernel属性的用法，它被自动注入到定义生命周期的类中。
Listing 4 shows the use of the kernel attribute that is automatically injected into the class that defines the life cycle code.
清单4显示了kernel属性的用法，它被自动注入到定义生命周期的类中。
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