Now that we've looked briefly at implementation, let's turn to the heart of this article: how two singletons can exist simultaneously.
前面已经简单地介绍了单例模式的实现方式，现在让我们进入主题：两个单例对象如何同时存在？
Since multiple versions of a bundle can co-exist simultaneously, one could deploy and maintain multiple versions of a web service at the same time.
由于一个包的多个版本能够共存，因此人们可以同时部署和维护多个版本的Web服务。
The parameter estimation problem in parameter adjustment model is considered when outliers and ill-conditioning exist simultaneously.
讨论了测量平差中粗差和病态性同时存在时的参数估计问题。
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