全息水閘修復現場

Architects restoring a century-old river floodgate while a pale cyan holographic projection shows the missing upper structure aligned over the real masonry, wet construction deck at dusk, two adult engineers in safety gear, credible scale and perspective, no UI text or logos

百年河道水閘修復現場，淡青色全息投影把缺失的上部結構準確疊合在真實石砌水閘上，黃昏溼潤施工平臺，兩名穿完整安全裝備的成年工程師，尺度與透視可信，無介面文字與標誌。