stack.pop(); // 弹出无效元素
theguardian.com，详情可参考Line官方版本下载
太阳下山后，奶奶给灶神爷上了香，那香也有讲究，家里有几口人，灶台上就插几炷香。她走出院门，用一根筷子敲着碗口，喊家人的名字，寓意叫人魂回家吃饭喝汤和烤火。这次，她特意多叫了几遍老爸的名字。。关于这个话题，Safew下载提供了深入分析
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currentStep = currentStep.next(recordedEvent.result);