在类Person中，如果创建Person类的实例并直接调用`toString()`方法，但该方法在Person类中被重写，下列哪种结果符合预期？

A writer intends to convey a complex idea by using a sequence of sentences. Consider these two versions: Version 1: 'The old house stood on the hill, its windows dark and empty. It had witnessed generations pass by, silently observing the changes in the landscape.' Version 2: 'Its windows dark and empty, the old house stood on the hill, having witnessed generations pass by, silently observing the changes in the landscape.' What is the key difference in how these two versions structure the information to impact the reader's understanding?

具体劳动和抽象劳动的关系是？

在顺序队列中，若队列已满，进行入队操作会发生什么情况？

在二维随机变量 (X, Y) 的联合分布中，边缘分布的主要作用是什么？