The unifying layer will be built using existing data source capabilities.
统一层将使用现有的数据源能力进行创建。
2
Therefore, in reality, we will adopt the extended layering for those two layers and we do not need to distinguish which layer is really built on top of the other.
因此，我们实际上将对这两个层采用扩展分层机制，不需要区别哪个层实际上构建在另一层之上。
3
One way around this is to use the Cygwin compatibility layer and a Perl built against that, in which case the compiler will be GCC.