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파란색 강철

View of a blue railway bridge structure with background scenery
@llunashiko9l

lluna

Modern building exterior featuring blue spiral staircase
@yu___koreedaY

YuKoreeda

Under construction stadium exterior with blue roof covering
ookinate23o

ookinate23

Blue steel train stopped at the station
taso583t

taso583

Night view of a blue bridge walkway with reflections on the water
@maruuま

まるう

View of a blue arch bridge with steel structure
creampastac

creampasta

Close-up of stacked blue pipes with rusted background
Maru_RM

Maru_R

Industrial structure featuring metallic pipes and a blue fence
ookinate23o

ookinate23

Structural steel arches under a blue sky
@k2pluskitaK

KITA

Metal fence featuring a blue wave design and an orange circle
@tatsun_s_createT

TATSU

Steel framework and blue scaffolding of a building under construction
ookinate23o

ookinate23