实际上没人能教人做任何事，你们能从我说的当中学到，我不能做什么，来是你们理解有效性的概念。

Actually nobody can teach anybody anything you can learn from what I say, there is nothing I can do to make you understand the concept of validity.

youdao

结构可以嵌套，但这一示例包含了每一个基本有效性概念。

Structures can nest, but every basic validity concept is included in the example.

youdao

这种可移动性概念会在数据和应用程序的安全性和可管理性方面造成问题，这些问题会限制移动解决方案的有效性并增加运营成本。

This concept of mobility creates issues of security and manageability of data and applications, and both issues limit the effectiveness of mobile solutions while increasing their operational cost.

youdao