For example, in Jam, the programmer is not allowed to pass this as an argument to a method; there is no way to type check such calls.

例如，在Jam中，禁止程序员将this作为参数传递给方法；无法对这样的调用进行类型检查。

youdao

The first time you encounter a Dictionary object in a calling method, you can check its type before working with it.

在调用方法中第一次遇到 Dictionary 对象时，可以在使用它之前检查它的类型。

youdao

How to check if property exists in Type in an extension method?

如何检查是否存在属性扩展方法中的类型？

youdao