cratering/ˈkreɪ.t̬ɚ.ɪŋ/名词形成凹坑The photograph shows heavy cratering, suggesting the area has been bombed.照片上显示出很多弹坑,说明该地区遭到过轰炸。崩溃;急速跌落The events of 2008 and the cratering of the economy thereafter were emergencies.2008年的事件和此后的经济崩溃是紧急情况。想跟读,去练习