1️⃣ Select OBJECT 2️⃣ Keep the realistic image clear and visible 3️⃣ Overlay black, hand-drawn engineering annotations (labels, dimensions, materials, cross-sections, arrows)
1️⃣选 OBJECT 2️⃣写实图保持清晰可见 3️⃣叠黑色手绘工程标注（标签、尺寸、材质、剖面、箭头）
