design reference period

例句：

1. 1. The designreference period for the new product is threemonths.
   新产品的设计参考期为三个月。
2. 2. Thecompany has set a design reference period ofsix months for the project.
   公司已为该项目设定了六个月的设计参考期。
3. 3. Thedesign reference period is crucial for ensuring thequality of the final product.
   设计参考期对于确保最终产品的质量至关重要。