It's called code switching.

这称之为代码转换。

Code switching is a common phenomenon in language communication.

在言语交际中语码转换现象非常普遍。

Code choice and code switching are general phenomena in social language.

语码选择与转换是一种普遍的社会语言现象。

The explanation of code switching will find its phenomenon theory in the psychology field.

对于语码转换的解释在心理学领域可以找到它的现象原理。

The second chapter is mainly analysing the goals and conditions of code switching during the programs.

第二章主要分析综艺节目中语码转换的目的和条件。