The concept of non-electrostatic field refers to the induced electric field stimulated by the changing magnetic field of reference system in a lab in electromagnetics.
非静电场这一概念，在电磁学里指对实验室参照系存在变化的磁场激发的感生电场而言。
Each of these indicates that a field reference is defined.
这种情况显示了一个已经定义的域引用。
If it is not a static class, you first need to declare the name of the field that will hold the reference to the parent class of the nested class before you get to the preview box.
如果它不是一个静态类，那么需要首先声明保存有对此嵌套类的父类的引用的那个字段的名称，之后才能看到这个预览框。
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