To add new methods to a particular class of type t, it only needs to define static methods that accept type t as the first parameter.

要向类型为t的特定类添加新方法，只需定义一个静态方法，它接受类型T作为第一个参数。

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The runtime type of the contained Pane will often be a subtype of class Pane, but the static type is simply Pane.

被包含的Pane的运行时类型通常会是类Pane的子类型，但是静态类型就只是Pane。

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You cannot declare a variable of type Static1 because it is marked as a static class.

您不能声明Static 1类型的变量，因为它被标记为静态类。

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