Conceptual designing

• 概念设计

Conceptual designing的用法和样例：

例句

1. The passenger aircraft is currently a conceptual design.
   如今，这种民用客机还只是一种概念设计。
2. A great mass of the cost of a product has been determined at the design stage, especially at the conceptual design stage.
   产品成本的绝大部分在设计阶段尤其是概念设计阶段就已基本确定。