// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
But for the US oil firms that Trump wants to invest heavily in Venezuela, the question is a simple one - do the numbers add up?
，更多细节参见51吃瓜
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HTMLMediaElement: play() method — MDN Web Docs，推荐阅读同城约会获取更多信息
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