虽然规范的示例使用矢量表达作为键和值，但是并没有限制您如何来定义值(例如一些值的汇总)。

Although canonical examples use the vector representation as a key and value, there's no restriction on how you can define the value (such as an aggregate of a number of values).

youdao

在常量表达式，比如枚举型常量、位域的宽度或是静态变量的初始值，是不允许使用在这种声明中的。

Embedded statements are not allowed in constant expressions, such as the value of an enumeration constant, the width of a bit-field, or the initial value of a static variable.

youdao

这些变量表示会随时间而变化的值。

These variables represent a value that can change over time.

youdao