Steel frame construction has replaced the use of reinforced concrete, and as these steel skeletons grow ever higher, a giant crane can always be found top and center, lifting things up and setting them down. No matter how tall a building rises, the crane always looms above it.
過去為人熟悉的「RC 構造」（鋼筋混凝土）已被「鐵甲基地」般的鋼骨結構取代，而在層層疊疊的鋼樑之上，總有一架巨秤狀的大吊車從結構中心聳然拔出，不管樓蓋得多高，這具吊架總是在工地的最尖端領銜攀爬。