建立专用车道系统需要对现有公路进行更广泛的物理改造，而它又保证了公路车辆通行量能够得到最大程度的提高。
A special purpose lane system would require more extensive physical modifications to existing highways, but it promises the greatest gains in freeway capacity.
原生裂缝是岩浆冷凝结晶过程中形成的裂缝； 次生裂缝是火山岩及其原生裂缝系统受后期构造运动、溶蚀、风化等作用改造而形成的裂缝。
Primary fracture were formed during the lava crystal and the secondary fracture generated during the volcanic reconstruction by tectonic movement, and wind action, solution.
在过去50年中，人类对生态系统的改造比历史上的任何时期都更为迅速而广泛。
Over the past 50 years humans had changed ecosystems more rapidly and extensively than any comparable period in human history.
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