In earlier times it was necessary to design structural systems suitable for the materials that were available, such as wood, stone, brick.
在早期，有必要设计适合现有的例如木材、石头、砖这样的材料的建筑系统。
2
A structural invention had to be made before the physical limitations of stone could be overcome and new architectural forms could be created.
在克服石头的物理限制和创造新的建筑形式之前，必须先完成结构上的创造。
3
The structural system was essentially trabeated and with stone being the basic raw material for the Indian craftsman, construction could be carried out with minimal or no mortar.