这些连接程序都是标准lei产品的一部分。
现在的线已不再是简单地穿过云，而是连接到云并将云用作应用程序的一部分。
Rather than simply passing through the cloud, lines now connect to the cloud and use it as part of an application.
创建数据源或数据库池的原因是它能够提高应用程序性能，因为即使打开一个连接也会十分占用CPU。
The reason for creating a data source or database pool is that it increases application performance, because opening even a single connection is a CPU-intensive operation.
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