Two of five stroke patients have a second attack within five years.

在中风患者中，五分之二的病人五年内会复发一次。

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This is the second attack on a high-ranking police officer in recent days.

这是在最近几天针对高级警务人员的第二起攻击事件。

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This is the second attack on a high-ranking police officer in recent days.

这是在最近几天针对高级警务人员的第二起攻击事件。

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