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.
这可能是由于20国集团面对全球经济做出的强力协作所刺激的结果。
That was prompted by a pledge by the Group of 20 nations to make a "strong and coordinated" response to confront renewed challenges facing the global economy.
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