另外，还要实现一些尚未实现的定制功能。

Additionally, some custom functionality that does not currently exist can be implemented in this layer.

youdao

但就全球而言，这仍是一个尚未实现的承诺。

But globally, it remains an unfulfilled commitment.

youdao

该设计也是可扩展的，因为它能够支持当前系统尚未实现的类型。

The design is also extensible because it can serve types not yet implemented by the current system.

youdao