期望值expect: vt. 1.期待,预期,预料 (sth., that). ...value: n. 1.价值;重要性;益处。 2.估价,评价。 3.价 ...ev expected value: 期望值earned value-ev: 挣值ev earned value: 挣值法下载手机词典可随时随地查词查翻译