既然实证主义不能解释哲学和理论，以及由此制定的计划和政策。那么其所谓的刺激—反应机制，就自证其错。
As long as positivism does not explain philosophies and theories, and the plans and policies derived from them, in terms of its stimulus-response scheme, it defeats itself.
结论：褪黑色素可通过作用于外侧缰核的阿片受体而影响其痛相关神经元对痛刺激的反应，这可能是褪黑色素中枢镇痛机制之一。
Conclusion: Melatonin can change the responses of pain neurons to pain stimulation via opioid receptor in the LHb, which might be one of analgesic mechanisms by MEL.
言语连锁学习的心理机制是联想，它形成的基本条件是刺激与反应之间的接近、重复与强化。
Its psychological mechanism is connecting in the mind and its basic condition through which form the mechanism is approaching repeat and consolidation of stimulus and reaction.
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