修改语言的语法以包括更详尽的类型参数界限。
Modify the language syntax to include more elaborate bounds on the type parameters.
另一种可能性是修改语言语法以包括更详尽的类型参数界限。
Another possibility is to modify the language syntax to include more elaborate bounds on the type parameters.
其原因是：在某些其它上下文中，mixin的参数可能用类型参数界限实例化了。
The reason: a mixin's parameters may be instantiated with type parameters bound in some other context.
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