conceptual design

• 概念设计

conceptual design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. Freehand sketching is an efficient way for idea externalizing and concept design.
   手绘草图是概念设计和思路外化的一种高效的表达方式。