Roman builders perfected the semicircular arch made of separate blocks of stone.
罗马的建造者完善了由不同的石块构成的半圆形拱门。
This iconic structure, built in Rome between 70 and 82ad, made spectacular use of the arch - a Roman architectural invention that has the beauty of opening up space but also being very stable.
这个代表性的建筑建于公元70 ~ 82年，用拱桥来显得蔚为壮观——这是罗马的建筑发明，它的美在于不仅扩大了空间，而且让建筑变得更加稳固。
In fact, he said, Roman structures that rely on the arch for strength can far outlast modern concrete buildings that rely on steel reinforcement bars, which eventually corrode.
实际上，他说，罗马结构依赖于高强度的拱，寿命远长于现代的依靠钢强化的混凝土建筑，而钢结构最终被腐蚀。
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