半退休教授卡罗琳·马文在面对费城日益壮大的机器人送货大军时成为了当地的名人：‘这是我的第一修正案装置’
Semi-retired professor Carolyn Marvin became a local celebrity facing down Philadelphia’s growing robot delivery army: ‘It’s my first amendment right to protest’
“One of you needs to be on the lookout for cops, while I block the robot, OK?”
It is a crisp fall morning in Philadelphia. Tucked away in a dingy alley, opposite a garage called Patriot Parking, 78-year-old Carolyn Marvin is laying out some ground rules for a
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