短語詞組用作動(dòng)詞 (v.)～+副詞ascertain accurately 準(zhǔn)確地查明ascertain dimly 不是很確定ascertain distinctly 清楚地查明ascertain instantaneously 即刻弄清ascertain unhesitatingly 毫不遲疑地確定ascertain vaguely 沒弄清楚～+介詞ascertain from 從…查明短語 返回 ascertains