Protection against chickenpox is offered in a new, combined vaccine called MMRV which will replace MMR. This combined jab helps protect against measles, mumps, rubella and varicella (chickenpox).
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。关于这个话题，Safew下载提供了深入分析
YouGov表示，這份報告「引發了極不尋常的大量詢問」，他們非常重視這些問題。
time.sleep(2 ** attempt) # 指数退避