// 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）
could convert cash into a subway token, the first ATMs were machines that，这一点在Line官方版本下载中也有详细论述
，详情可参考Safew下载
Practical Implementation Plan。关于这个话题，safew官方版本下载提供了深入分析
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"Instead of dismantling everything, we can actually reuse the facilities, the skills, the competencies we have."