只替换已标定设计体量

提示词

合成时只替换已标定的设计体量区域，周边真实建筑、道路标记和地形保留。新体量遮住或露出的部分按已确认遮罩和背景资料处理。

Replace only the marked design-volume area in the composite, retaining real surrounding buildings, road markings, and terrain. Handle newly covered or revealed areas using the approved masks and background references.