This is especially important when asynchronous invocation is used where the calling task has to look for the output of the called task appearing at a particular location to continue further.
当使用了异步调用，而调用的任务需要查找所调用任务在特定位置生成的输出才能够继续后续操作时，这种方法是特别重要的。
This is especially important when asynchronous invocation is used where the calling task has to look for the output of the called task appearing at a particular location to continue further.
当使用了异步调用，而调用的任务需要查找所调用任务在特定位置生成的输出才能够继续后续操作时，这种方法是特别重要的。
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