Past investigations indicated that rewarding effect of abusive drugs is considered as the major reason, which results in addiction especially psychological dependence.
成瘾是精神活性物质长期作用于大脑而产生的神经适应性改变，而成瘾性物质的奖赏效应则被认为是产生精神依赖的最主要原因。
Artificial chemical synthesis, a direct role in the human central nervous system of the new drugs, with a high degree of psychological dependence (addiction) is characterized.
人工化学合成的、直接作用于人的中枢神经系统的新型毒品，以高度的精神依赖(成瘾)为特征。
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