从业务角度看，对这个接口的投射会映射到以下接口。
From the business perspective a projection of this interface would map to the following.
区别是现在将系统的横切关注点映射到使用了投射到相关维中的多维接口的方面。
The difference is that you now map the system's crosscutting concerns to aspects that use a multidimensional interface, which is projected into the associated dimensions.
注意通配符实际并不会怎么弱化静态类型系统，因为它通常和映射APIs（总是要求投射明确）一块出现。
Note the wildcard feature does not really weaken the static type system much, because it typically only kicks in with reflection APIs (which would have have required an explicit cast anyways)...
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