看到无辜的孩子们被杀害,美国一百多个城市的市长们再次誓言要严厉打击非法武器走私,扑灭枪支犯罪活动, "The mayors vowed to snuff out gun crime." 他们说,减少枪支犯罪,关键是要消除非法枪支买卖, snuff out illegal gun trafficking。不过控制非法枪支谈何容易。但愿市长们能够成功, snuffing out crime is our best hope for safe streets and schools. 今天学的词组是snuff out...