基本解釋自由項目英漢例句雙語例句But the shift into travel spending, seen as a big-ticket discretionary item, is a sign perhaps of the next stage of the recovery.但旅游支出作為大額非必需品消費，可謂經(jīng)濟進一步恢復的信號。discretionary item更多例句詞組短語短語Non -Discretionary Item 必須支出項目discretionary item更多詞組專業(yè)釋義計算機科學技術離散項目