我国每年约有1.5亿跨省流动人口。通过全面取消在就业地参保户籍限制、推动公积金异地取用等，我国劳动力和人才得以顺畅流动，集聚能力显著增强。
Equal: Every domino half in this space must be the same number of pips.
。旺商聊官方下载对此有专业解读
A simpler API would mean fewer concepts, fewer interactions between concepts, and fewer edge cases to get right resulting in more confidence that implementations actually behave consistently.
// 栈不为空时才判断（避免访问stack.at(-1)时报错）