Why an equals sign?

为什么是一个等于号？

Note the equals sign before the body of double.

注意double主体前的等于号。

It's not an equals sign like we've seen before, or a double arrow.

并不是我们前面看到过的等号，或者双箭头。

Does the equals sign make a difference in brace initialization?

这等于是在括号初始化的区别吗？

The expression to the left of the equals sign is not a valid target for an assignment.

等号左边的表达式，对于赋值，并不是一个有效目标。