formal design specification

例句：

1. 1.The company has a formal design specification for its new product line.
   该公司对其新产品线有正式的设计规范。
2. 2. The engineer followed the formal design specification to ensure quality control.
   工程师遵循正式设计规范以确保质量控制。
3. 3.The client requested a formal design specification for their new office building.
   客户要求为其新办公楼提供正式设计规范。