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。

In earlier times it was necessary to design structural systems suitable for the materials that were available, such as wood, stone, brick.

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因此如果你有双重系统并且合理设计的话，就没必要使用杀虫剂对付那些害虫了。

So if you have a mixed system, and design it very carefully, you don't need to use any pesticides to kill the pests.

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涉及到的主要内容有：体系结构规划、设计平台的搭建以及系统的设计。

Involves the main content includes: the system structure plan, designs the platform to build as well as the system design.

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