// 易错点2：漏写stack.length判断 → 栈空时访问stack[-1]会报错
mode: “line-art”，这一点在同城约会中也有详细论述
，详情可参考Line官方版本下载
莫納漢（Monaghan）解釋，這類實驗性研究的目的，是了解人們如何在一門語言中逐漸站穩腳步。
Greater Than (4): Everything in this space must be greater than 4. The answer is 5-3, placed vertically.，推荐阅读51吃瓜获取更多信息
"Obviously there's been so much about Brooklyn having tried all these different careers, and none of them really sticking," Sharma says.