This is not a safe thing to do for many types of applications.
对于许多类型的应用程序来说，这样做并不安全。
Therefore, it's not appropriate for many types of applications.
因此，对于许多类型的应用程序，它是不适合的。
Now let's look at the differences between the two types of applications.
现在我们看看两种类型的应用程序之间的区别。
You can imagine many types of applications that might use such a system.
不难想象，在很多种应用程序中都可以使用到这个系统。
In addition, these applications may need to work with different types of databases.
此外，这些应用可能需要在不同的数据库上工作。
The first types of application we will learn to create are command-line applications.
我们将学习建立的第一种应用程序类型，就是命令列应用程序。
The first types of application we will learn to create are command-line applications.
我们将学习建立的第一种应用程序类型，就是命令列应用程序。
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