To support registration of instances, we add additional syntax to their definition.

为了支持实例的注册，我们在它们的定义中添加了额外的语法。

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The syntax of a for statement is similar to a function definition.

for语句的语法跟函数定义有点相似。

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The syntax of a for statement is similar to a function definition.

for语句的语法跟函数定义有点相似。

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