where existing

基本解释

Linux is worth considering, especially if it is the only option where existing hardware can be utilized.
Linux 是值得考虑的，尤其在可以利用现有的硬件的情况下，Linux 是唯一的选择。
This is an analysis that determines where existing data sources have broken down and contain embedded logic in the data itself.
该分析确定已有的数据源在什么地方被断开，并在数据本身中包含内嵌的逻辑。
For completeness, we should note that in the rare case where existing providers match exactly the semantics of the service model, the service bus can be considered a limited integration layer.
为了全面，我们应该指出，在现有提供者正好匹配服务模型的语义这一很少见的情况下，可以把服务总线看作功能有限的集成层。

Is there any way to imagine existing forever ? where that would be good for you,forever?
有没有想象永远存在的办法,永生对于你来说是好事吗？
耶鲁公开课 - 死亡课程节选

At first they were restricted to inner-city areas where existing schools had failed.
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And this is where existing enterprise resource planning (ERP) and mobile technologies can come together to change the status quo, and do so quite radically.
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