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自杀是人类十大死亡原因之一。全世界每年大约有40～60万人自杀死亡，其中青少年自杀率逐年上升。导致自杀的因素是多方面的，重点是自杀的预防。本文系统地讨论了自杀的基本概念、概念的变迁和自杀的有关危险因素。
Suicide is one of the top ten causes of human death. About 400,000 to 600,000 people commit suicide each year in the world, of which the suicide rate among adolescents has risen year by year. The factors that lead to suicide are manifold and the focus is on the prevention of suicide. This article systematically discusses the basic concepts of suicide, conceptual changes and related risk factors for suicide.