You can have circular references in a partial project.
在部分专案中，可以使用循环参考。
As these two code samples show, circular references are easy to create.
正如这两个代码示例所示，循环引用很容易创建。
Circular references are not always bad and, in fact, are sometimes absolutely necessary.
实际上，循环引用也不总是有害的，有时它是完全必需的。
Circular references are not always bad and, in fact, are sometimes absolutely necessary.
实际上，循环引用也不总是有害的，有时它是完全必需的。
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