Between the motherboard of engine room and upper tower, each section of tower, tower is connected with conduction joint except for its own bolt union.
机舱底板与上段塔架之间、塔架各段之间、塔架除本身螺栓连接之外还增加了导体连接。
2
Bolt from the blue: Seen from the Hancock Tower, lighting strikes both the Willis Tower, right, and the Trump Tower in downtown Chicago as a severe storm rolls through the region last night.