在这个例子里，这个结构类型由一个有着特定签名的方法定义。
In this case, the structural type is defined by a method with a particular signature.
这个大于的操作符的时候,是到类的定义里去识别，大于是一个比较的方法,那么让我在这里说仔细一点吧。
When I try and evaluate that expression of greater than, is going to go into the class to say greater than is a comp method.
如果知道了，向量空间在单连通区域内处处有定义，那么就可以毫无顾忌地，在这个区域里使用格林公式了？
Well, if you know that your vector field is defined everywhere in a simply connected region, then you don't have to worry about this question of, can I apply Green's theorem to the inside?
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