6.In order for the structure to achieve the size and strength necessary to meet its purpose, architecture employs methods of support that, because they are based on physical laws, have changed little since people first discovered them —even while building materials have changed dramatically .
In order for (to achieve the size and (necessary to meet its purpose)strength )the structure, architecture employs (of support that)methods , because they are based on physical laws, have changed little since people first discovered them —even while building materials have changed dramatically .
为了（达到规模和（为达到目标必要的）强度的）结构，建筑师提出支持的方法，因为这些方法依据物理规律，自从发现之后再没有人改变过的规律，甚至建筑材料发生很大变化。
虽然建筑材料发生很大变化，建筑方法不变。
建筑方法不变是因为物理规则不变。
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Unchanging physical laws have limited the size and strength of buildings that can be made with materials discovered long ago.
Unchanging physical laws have limited the size and strength of (that can be made with (discovered long ago) materials )buildings .
未改变的物理规则限制了规模和强度，该强度可被多年前发现的材料所塑造。。
--------不变的是规则而不是材料。
--------材料与强度之间不是因果，规则与强度之间是因果
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Building materials have changed in other to increase architectural size and strength, but physical laws of structure have not changed.
Building materials (in other to increase architectural size and strength) have changed , but physical laws of structure have not changed.
建筑材料（为了增强建筑的规模和强度的）改变，但是建筑的物理规则是不会改变的。
-----------没有提及建筑方法
--------材料与强度之间不是因果，规则与强度之间是因果
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When people first started to build, the structural methods used to provide strength and size were inadequate because they were not based on physical laws.
When people first started to build, (used to provide strength and size )the structural methods were inadequate because they were not based on physical laws.
当人们开始建筑的时候，（提供强度和规模的）建筑方法不多是因为这些方法没有依赖物理规则。
----不是没有依据物理规则，而是依据了物理规则
-----物理规则与建筑方法之间的因果
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Unlike building materials, the methods of support used in architecture have not changed over time because they are based on physical laws.
Unlike building materials, the methods of (used in architecture)support have not changed over time because they are based on physical laws.
不像建筑材料，因为建筑方法依据物理规则没有改变所以建筑方法没有改变。