The reason VB and C# can use different implementations is that anonymous types are a compiler feature.

VB和C#之所以能不同的实现方式是因为匿名类型是一个编译器特性。

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By introducing code written against the interface and having multiple implementations of the interface, there are fewer optimizations that can be done by the GWT compiler.

通过引入针对该接口编写的代码并拥有多个接口实现，GWT编译器可以实施的优化将变得很少。

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In the regexp world, there are some compiler options supported by only certain implementations.

在regexp领域中，一些编译器选项仅被某些实现支持。

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