冬在集市上买了10斤本地小米，比山西沁州黄好吃。话说回来，牌子也不白给，米吃不吃在其次，字儿记牢了——沁人心脾——“沁”字得民心。大米冬只认五常大米，好像吃个大米也要讲仁、义、礼、智、信。卖小米的老头儿兼卖腰带。小镇的集市就这种好，不像商场超市，分门别类固定搭配。小米、腰带，这两种东西一般不会做邻居。老头儿说一口标准普通话，这在遍地乡音的矿区不多见。他打开手机相册给冬看老照片：勋章合影、老兵合影、家庭合影……他说自己年轻时随部队支援过柬埔寨，战斗很激烈，能活着回来实属运气好。老人与冬聊得热络，聊饿了，指使冬去给他买张大饼。在集上卖东西的老人，有着共同的面目：倔强、寡言、木讷、大嗓门，穿戴款式老旧的衣帽和围巾，干什么都不慌不忙。多数情况下，冬专买这些老人种的和养的东西。冬认为他们很可能是最后一代用传统农耕劳作自给的人。他们的子女基本上都到城里去打工上学。
However, in a narrow set of cases, we believe AI can undermine, rather than defend, democratic values. Some uses are also simply outside the bounds of what today’s technology can safely and reliably do. Two such use cases have never been included in our contracts with the Department of War, and we believe they should not be included now:
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Dan Fogelman's sci-fi thriller Paradise goes beyond the bunker in Season 2, showing viewers what the world looks like in the aftermath of the mass extinction event shown in Season 1. While Xavier Collins (Sterling K. Brown) is searching for his wife, Teri (Enuka Okuma), he runs across new survivors like Annie (Shailene Woodley). Elsewhere, the bunker is in chaos, with Samantha "Sinatra" Redmond (Julianne Nicholson) doing everything to keep things under control. She's also got a secret project cooking, which may or may not involve time travel.，更多细节参见一键获取谷歌浏览器下载
* 时间复杂度：O(n)，空间复杂度：O(n)