// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）
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。业内人士推荐谷歌浏览器【最新下载地址】作为进阶阅读
這是一個古老又熟悉的故事：男孩遇見男孩。
"The reality is his fellow ministers are happily pushing through the construction projects of Trump-supporting tech giants, without a thought for the environmental carnage."