今天我们要学的词是 cusp。Cusp 是尖端、浪尖，常用的表达方式 on the cusp of 是指正处于转变时刻。Fed Chairman Jerome Powell said he believed the U.S. economy was on the cusp of a "historically rare" era of ultra-low unemployment and tamed inflation. 美联储主席杰罗姆·鲍威尔表示，他相信美国经济正进入一个“历史罕见”的超低失业率和通胀平缓的时代。Hurricane Michael is on the cusp of becoming a Category 4 hurricane with maximum sustained winds of 225 kmh winds, according to the National Hurricane Center. 根据国家飓风中心的数据，飓风迈克尔马上将升级为4级飓风，最大持续风速为每小时225公里。