开发人员需要理解CIT才能优化.NET应用程序的性能。

Developers need to understand ___CIT to optimize the performance of .NET applications.

这个城市的地铁系统升级了最新的C.I.T.系统来提高安全性。

The subway system in this city has upgraded to the latest ___C.I.T. to enhance safety.