Users often have a good perspective on the legacy system.

用户经常对遗留系统有很好的观察。

This tightly couples the legacy system with every consumer of the data.

这让数据的每个消费者都和遗留系统发生了紧耦合。

Hopefully, if the legacy system is a good one, most of your tests will pass.

如果遗留系统是一个好的系统，您的大多数测试还是很有希望通过的。

Second, the use cases help us build a hypothetical architecture of the legacy system.

第二，用例帮助我们构建遗留系统的假设架构。

But what if you have a legacy system that was not designed with patterns like adapters?

但如果你有一个传统的系统，但是它不是使用像适配器这样的模式设计的。