time.sleep(2 ** attempt) # 指数退避
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One Saturday, a 16-year-old hauled a heavy, three-foot tube into the middle of a large field in Wisconsin.。业内人士推荐WPS下载最新地址作为进阶阅读
在本代机身的周边细节和外观上，三星也做了一道艰难的加减法。
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