a reaction by a living thing against attacks by enemies or diseases 防御机制：生物对敌人或疾病袭击的反应 The immune system is the body's major defence mechanism. 免疫系统是身体的主要防御机制。 Plants have complex defence mechanisms, both chemical and electrical. 植物有复杂的防御机制，包括化学的和电的。
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psychology 心理 a way in which somebody behaves without thinking about it to protect themselves from unpleasant feelings or situations 防御机制：一种行为方式，无需思考就可以保护自己免受不愉快的感觉或情况的影响 He uses humour as a defence mechanism. 他用幽默作为防御机制。 Buying expensive things despite poverty is often a defence mechanism. 尽管贫穷，但购买昂贵的东西往往是一种防御机制。