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美国之音是您的可靠和准确的有关美国和世界新闻的来源。阅读最新的新闻,收看美国之音电视,收听我们的广播节目或练习您的英语。
The updated COVID-19 boosters from Pfizer Inc /BioNTech SE and Moderna helped prevent symptomatic infections against the new XBB-related subvariants, offering new evidence of how the vaccines perform
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