In the context of moral philosophy, the principle of double effect is often invoked to justify actions that have both positive and negative outcomes. Which of the following scenarios best illustrates the application of this principle?

对于神经症患者而言，理想化形象的存在可能导致哪些心理行为的变化？

She felt ______ when her colleague received the promotion she had been expecting.

在共产主义社会中，三大差别将会如何变化？

商品经济产生的历史条件中，以下哪一项不是必要条件？