红色易燃气体钢瓶顶部阀门特写

方形1:1白底俯拍特写，一只红色金属易燃气体钢瓶的顶部正对镜头。顶部为宽大的圆形红色漆面，表面有大量划痕、掉漆、灰黑色污渍和边缘磨损；中央下凹圆环凹槽内立有灰蓝色三瓣旋钮阀门，中心带金色十字螺丝，阀门下方连接黄铜色螺纹金属接口。底部弧面印有灰白色英文警示字样“Warning / Highly Flammable Gas”，字迹略旧。构图居中、近景俯视，无人物、无手、无其他物体；均匀漫射光，略带冷调，白色纯净背景，高细节写实产品摄影风格，方形画幅。

Square 1:1 overhead close-up on a clean white background: the top of a red metal highly flammable gas cylinder facing the camera directly. The broad circular red painted top is heavily scratched, chipped, stained with dark grime, and worn along the edges. Inside a recessed circular groove sits a gray-blue three-lobed valve knob with a gold-colored cross screw at its center, connected below to a brass-colored threaded metal fitting. Near the bottom curved surface, faded gray-white warning text reads “Warning / Highly Flammable Gas.” Centered composition, close-up top view, no people, no hands, no other objects; even diffused slightly cool lighting, pure white background, highly detailed realistic product photography, square format.