求翻译：“材料，施工，理论”是土木工程的三要素。正是这三要素的相互影响和促进，才有了土木工程的不断发展，而其中又以材料最为关键。砖瓦的出现使得古代的土木工程发生了第一次飞跃；十九世纪中叶，钢材和钢筋混凝土在建筑营造中的应用则使近代的土木工程发生了革命性的变化，实现了第二次飞跃；至二十世纪中叶，预应力混凝土的发明和广泛使用则是土木工程的第三次飞跃，标志着现代土木工程的开始。是什么意思？

Materials, construction, theory is the three elements of civil engineering. It is these three elements influence each other and to promote, only the continuous development of civil engineering, among which the material is the most critical. Tile emergence of the civil engineering of the ancient firs

"materials" theory, construction, civil engineering is the 3 elements. It is the 3 elements of the mutual influence and promote that the civil engineering, continuous development of the material which was most critical. Adobe has made the ancient civil engineering have been the first leap, mid- 19th

“The material, the construction, the theory” is the civil engineering three essential factors.Is precisely these three essential factor mutual influence and the promotion, only then had the civil engineering unceasing development, but is also most essential by the material.The bricks and tiles appea

"Material, construction, theory" are three key elements of civil engineering. Is the interaction of these three elements and the promotion of, the civil engineering of evolving, and in the material is most critical. Tile makes the emergence of civil engineering in ancient times first leap; the middl

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