正在确认阅读权限…
Why Bridges Don’t Fall Down
为什么桥梁不会倒塌
-
Engineers plan bridges very carefully first.工程师会先非常谨慎地规划桥梁。
-
Strong steel and concrete hold heavy weight.坚固的钢材和混凝土能承受重载。
-
Arches and triangles spread force evenly.拱形和三角形结构可均匀分散受力。
-
Pillars push down into solid ground or rock.桥墩向下压入坚实的土地或岩石中。
-
Wind and traffic cause small, safe movements.风力和车流会引起微小但安全的位移。
-
Sensors check stress and temperature daily.传感器每天监测应力和温度。
-
Workers fix tiny problems before they grow.工人在小问题扩大前及时修复。
-
Good design keeps people safe for many years.优秀的设计能长久保障人们的安全。