求翻译：First, a Kaplan-Meier survival curve is applied to these renewal data in different country groups, as shown in Fig.2,where x-axis是什么意思？

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悬赏分：1 - 离问题结束还有

First, a Kaplan-Meier survival curve is applied to these renewal data in different country groups, as shown in Fig.2,where x-axis

问题补充：

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