The material for building the bridge must be very strong so that it may not break in use.
为使桥梁不致在使用中断裂，建造桥梁的材料强度必须非常高。
If the material were less rigid, it wou1d not break so easily.
如果那个材料不那么刚硬，它就不那么容易碎。
However, within recent 140 years, different new theories of Darwinism did not break through the constraint of material science and philosophy in industrial era.
而140年来，种种新达尔文主义理论也并没有突破工业时代的物质科学和物质哲学的束缚。
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