Each separately called program is a program invocation instance.

每个被单独调用的程序就是一个程序调用实例。

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The language element persists only within a particular program invocation.

语言元素则仅存在于特定的程序调用中。

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This component has one function, and it is called by the feed aggregator at the very beginning of the program invocation.

此组件有一个函数，在程序调用的最早阶段由提要聚合器调用。

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