海子自杀的深层次因素从三个方面得到呈现：焦虑、异化、孤独等精神困境；他作为存在勇气的基础和存在前提的信仰；以及对生命个体精神危机的心灵拯救。
The mental troubles of Haizi are presented from four aspects: anxiety, alienation, loneliness and the crisis of belief which plays the basis and the prerequisite for human being to exist in the world.
勇气存在于其它三个价值的环境中。
Courage exists within the context of the other three values.
单元测试还给了开发人员勇气重新划分代码，因为测试失败可以立刻告诉开发人员存在错误。
Unit tests also give developers courage to refactor the code, because a test failure tells the developer immediately if something's broken.
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