A sleek, black and gold mecha arm with advanced materials and futuristic design elements. The prominent shoulder pad is on the left side of its upper body, while it holds out an open palm for dynamic action poses. It features multiple visible mechanical parts beneath skin, adding to its high-tech appearance. This detailed concept art captures every detail in an ultra-realistic digital rendering style in the style of digital rendering. White background. --ar 3:4 --style raw --stylize 1000 --v 6.1

一只流线型的黑金色机甲手臂，采用先进材料和未来主义设计元素。显眼的肩垫位于上半身的左侧，同时手掌张开，展现动态动作姿势。它具有多个可见的机械部件在表皮下，增加了其高科技外观。这幅详细的概念艺术以超现实的数字渲染风格展现每个细节，背景为白色。