Professor, that was quite the seminar on retrofitting smart cities.

教授，你关于改造智慧城市的研讨会真是精彩。

Much of this business involves retrofitting existing planes.

这项业务主要是改造更新现有的飞机。

Retrofitting your checkout path: First steps.

改造结帐过程：首要步骤。

Introducing the concept: Retrofitting your site with ajax.

概念介绍：使用Ajax改进您的站点。

Don't let your credibility and people's trust erode by retrofitting rules.

不要让更改规则这种状况削弱你的信用值，降低人们的信任度。

That's why the group favors retrofitting existing cars with electric-drive engines.

这就是为什么这个组织希望用改进现有汽车，用电作为动力的方法来达到目的。