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.

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。

youdao

I once read that the single-biggest reason we like someone is because we think they like us.

我曾经读到一个观点，我们喜欢某人的最大原因是我们认为他们喜欢我们(好绕- - ！)

youdao

The reason for writing this article is, when I started working on this, I faced a lot more problems because I didn't find all the information in a single place.

之所以写这篇文章，就是因为我在做这个功能的时候，发现了许多的问题，都是因为没有一个地方总结了所有相关信息。

youdao

And one reason we know this is because of the demonstrated case studies where a language is created within a single generation.

我们之所以这样认为,是因为有许多的个案研究,都证明了一代人之内是可以创造出语言的

耶鲁公开课 - 心理学导论课程节选

Although ChildLine is associated with helping children raise concerns about abuse, the biggest single reason for children getting in touch is because of "family relationships".

BBC: Self-harm calls to ChildLine show biggest increase