The risks of working in a place where volcanic activity seems to have stopped but may suddenly resume are uncertain.

工作的危险在于，此处的火山活动表面上已经停止，但可能会突然重新开始。

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suddenly stopped operating on Sept. 27. With less financial incentive to send their junk mail, spammers curtailed their activity by an estimated 50 billion messages a day.

在9月27日突然停止运营，缺少了财政支持，垃圾邮件制造者每天会少发500亿封垃圾邮件。

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First, over time the brain adjusts to their activity, so that if they are stopped suddenly, brain activity can overshoot normal.

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