// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）
Екатерина Щербакова (ночной линейный редактор)
。业内人士推荐爱思助手下载最新版本作为进阶阅读
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For the U.S., the stakes of this transition are uniquely high. As a primary hub for the global AI infrastructure boom, the U.S. is poised to capture a significant portion of the projected $3 trillion in data-center-related investments over the next five years, as projected by Moody’s. However, this leadership comes with a steep entry fee: massive demands on power grids and digital connectivity that require enormous spending before productivity gains ever hit the bottom line.