Even a small drop in temperature leads to an increase in the number of people who suffer a heart attack, say researchers.

研究人员称，即使很小范围内的温度下降，也能导致心脏病发作人数的增加。

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When schools drop the pledge, it's interpreted as an attack on patriotic values.

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But last year sales started to drop due to fears of an extremely rare side effect that might itself cause a deadly heart attack.

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