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time.sleep(2 ** attempt) # 指数退避
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没了子宫的兰丽决定代孕。她向南方周末记者回忆，起初丈夫反对，但她坚持，“我和他说‘就当是对我的补偿’”。
They went to the international courts and were awarded huge sums in damages – $8.3bn in the case of ConocoPhillips – which have never been paid.