原标题：疾控：新冠灭活疫苗能污染接种点人群或环境 但不具传染性 In recent years, the U.S. domestic politics has been mired in infighting, with key issues affecting government operation, people's lives and national development have become partisan bargaining chips. A real-life version of "House of cards" is playing out. (Wei Chenxi, Yang Xin)
