How unusual are the cases we saw in this week's readings where self-interest plays a role in shaping participation patterns?

这星期书目案例中说明私利形成参与模式，这究竟有多少是不寻常？

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When operating properly, the monitors constantly sample the air and send data to EPA headquarters, where computers monitor the data and alert officials to unusual readings.

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Neutral sentiment readings at the current level have been unusual over the past few years.

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