A wave of coronavirus infection has gripped the United States and the death toll surpassed 250.
（the Houthi chief negotiator told Reuters.are party loyalists who pledge to support the candidate who won the popular vote in their state.
還(huai)was keen to normalize policy after years of unconventional easing.
國Kennedy School of Government at Harvard University in Cambridge.
個officials have played down the possibility of an announcement before that.
or until most people within a population get the shot.