"Upgrade and replacement" 是升级换代的英文短语。这个短语通常用来描述在保留原有基础的情况下，更换新的、更先进的设备或系统的过程。例如：

We are planning to do an upgrade and replacement of our computer systems next year.
The company is considering an upgrade and replacement of the old machinery in the factory.

另外，升级换代也可以用 "upgrade and renew" 或 "replace and upgrade" 来表达。例如：

We need to upgrade and renew our software to keep up with the latest technology.
The company is planning to replace and upgrade the old equipment with more efficient models.

希望这些信息能帮到你！