eight . 8天.
需要注意的是：第7天爬升到9英尺后滑下2英尺,则第八天要从7英尺处开始往上爬3英尺,刚好到了墙顶,不存在滑下的情况了.
英语翻译1.\x05An ant wants to climb a wall of 10 feet high.Durin
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