self.db_path = "spider.db"
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// 条件解读：栈非空 + 栈顶当前数 + 还有删除名额 → 弹出栈顶（移除大数）
下一代3系将推出M350 xDrive，取代现款M340i xDrive，同时还将新增i3 40 xDrive、i3 50 xDrive两款纯电车型。
Burger King is one of several fast food chains experimenting with artificial intelligence. Yum Brands said last spring it was partnering with Nvidia to develop AI technologies for its brands, which include KFC, Taco Bell and Pizza Hut.