Three-tier architectures and popular frameworks make this isolation more difficult, because the developer might never see the SQL generated by the framework.

层架构和流行的框架让隔离过程更加困难，因为开发人员可能永远不能看到框架生成的 SQL 语句。

youdao

I have been part of several development efforts in which the Web developer developed 80% of the Web tier without the actual services being available.

我现有的几个开发工作中，Web开发人员在无实际服务可用的情况下开发了80%的web层。

youdao

Microsoft Live Labs has released Volta - a technology preview of a developer toolset that will enable developers to build multi-tier web applications faster.

微软Live实验室对外发布了Volta技术预览版——一个可以使开发者更快地构建多层web应用的开发工具集。

youdao