This is called an assignment statement because we're assigning a value to a variable.
这称为赋值语句，因为我们正在为变量赋值。
科技 Crash Course
This is a bit confusing because the variable is using itself in an assignment statement, so let's unpack it.
这有点令人困惑，因为变量在赋值语句中使用它自己，所以让我们解包它。
英语百科
Assignment (computer science)
（重定向自Assignment statement）
In computer programming, an assignment statement sets and/or re-sets the value stored in the storage location(s) denoted by a variable name; in other words, it copies a value into the variable. In most imperative programming languages, the assignment statement (or expression) is a fundamental construct.