消沉有很多原因，包括任何人消沉都合乎情理的真实条件。

Depression can have many causes, including actual conditions about which it is reasonable for anyone to be depressed.

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在逻辑中，指两个命题被归为真实条件命题的前因与后果时二者之间的关系。

In logic, a relation that holds between two propositions when they are linked as antecedent and consequent of a true conditional proposition.

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换言之，道德规范能够表达这些真实条件，以便实现普遍人性的目标；从这一点上讲，道德规范是客观的。

In other words, moral rules can be objective in the sense that they can express the real conditions for the achievement of universal human goals.

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Mechanisms like habituation, classical conditioning and operant conditioning are real; they can be scientifically studied; and they play an important role in the lives of animals and probably an important role in human lives as well.

诸如习惯化，经典条件作用，操作性条件作用之类的机制,都是真实存在的;,这些机制都能得到科学的研究;,它们在动物的生活里起到了重要的作用,或许在我们人类的生活中,也同样起到了重要的作用。

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