每一位被试者在经历实验之后，要说出他所感受的疼痛程度。

Each participant rated the level of pain after the task was performed.

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在一项实验中，多名志愿者被注射了强力的止痛剂，随后让他们接受一个疼痛的刺激物——由于止痛剂的原因，他们对疼痛毫无感觉。

In one experiment volunteers were given a powerful analgesic and subjected to a painful stimulus-which, because of the analgesic, they could not feel.

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麦基博士提醒说，此实验是在一个十分受控的实验环境下做的，它尚不能分辨出慢性疼痛和急性疼痛。

Mackey cautioned that the study was done in a very controlled lab environment, and it did not look at the differences between chronic and acute pain.

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