Based on the regulation law of immunity feedback response in biology, a compound path tracking control method is proposed for the problem existing in the non-time based approach of mobile robots.

针对移动机器人非时间参考控制方法的不足之处，借鉴生物免疫反馈响应过程的调节规律，提出了移动机器人的免疫非时间参考路径跟踪控制方法。

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But when the emotion that leads to stiffening the lip is more intense, and involves strong muscle tension, facial feedback may heighten emotional response.

但是当导致嘴唇僵硬的情绪变得更加强烈，并导致肌肉强烈绷紧时，面部表情反应就可能会增强情绪反应。

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Polyphasic Sleep - Response to Reader feedback.

多相睡眠——作答对者反馈。

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These findings would not have surprised Charles Darwin, who in addition to theorizing on evolution in The Origin of the Species, also developed the Facial Feedback Response Theory, which suggests that the act of smiling actually makes us feel better (rather than smiling being merely a result of feeling good).

FORBES: The Untapped Power Of Smiling

It also means that as users react and provide feedback, the roles within the group become more defined in response to that feedback.

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But the protesters claim they have tried to answer such concerns, reorganising their camp "in response to feedback from the fire brigade".

BBC: Talks continue on St Paul's and protest closure decision