constant expression

基本解释

We cannot use an constant expression "that designes the adress… ", but could we use a converted constant expression?
我们不能用一个常量表达式，设计了地址……”，但我们可以使用转换常数表达式？
If the expression can be verified as a constant, then a constant expression (which is available for optimization) is used.
如果发现表达式是常量，那么就使用可以优化的常量表达式。
Extract Constant is similar to Extract Local Variable, but you must select a static, constant expression, which the refactoring will convert to a static final constant.
Extract Constant 与 Extract Local Variable 相似，但是您必须选择静态常量表达式，重构工具将会把它转换成静态的 final 常量。

And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.
也会遇到它,在这里，你可以就把它,理解为一个转换系数,我们需要做的。
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