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Detecting e-bike battery fires, for example, is particularly difficult, since these can unfold suddenly. Some researchers are working on new ways of sensing smoke and fire, perhaps even more quickly than before. But, take note: any certified, working smoke alarm is better than nothing.，推荐阅读夫子获取更多信息
Photorealistic image generation。爱思助手下载最新版本是该领域的重要参考
* @param arr 数组