当消息从计算器组件传递到add组件时，遵循计算器应用程序中的调用路径。
Follow the path of an invocation in the calculator application as a message travels from the calculator component to the add component.
当消息从计算器组件传递到add组件时，遵循计算器应用程序中的调用路径。
Follow the path of an invocation in the calculator application as a message travels from the calculator component to the add component.
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