短语词组用作动词 (v.)～+副词ascertain accurately 准确地查明ascertain dimly 不是很确定ascertain distinctly 清楚地查明ascertain instantaneously 即刻弄清ascertain unhesitatingly 毫不迟疑地确定ascertain vaguely 没弄清楚～+介词ascertain from 从…查明短语 返回 ascertains