crackdownn.（名词）An act or example of forceful regulation, repression, or restraint:制裁：采取严厉措施、镇压、约束的行为或实例：a crackdown on crime.对犯罪进行制裁quellv.tr.（及物动词）quelled， quell.ing， quellsTo put down forcibly; suppress:用武力平息；镇压：Police quelled the riot.警察平息了暴动To pacify; quiet:使平静；安静：finally quelled the children"s fears.最终驱散了孩子们的恐惧
