| 释义 |
delta/ˈdeltə/n. 1 a triangular tract of deposited earth, alluvium, etc., at the mouth of a river, formed by its diverging outlets (沉积土、冲积层等的)三角洲 2a the fourth letter of the Greek alphabet (Δ，δ)希腊字母表的第 4 个字(Δ，δ) b Brit. a fourth-class mark given for a piece of work or in an examination [英] (工作或考试成绩的)第四等 3 (作 Delta) Astron. the fourth (usu. fourth-brightest) star in a constellation (foll. by Latin genitive 后跟拉丁语属格 : Delta Cephei 仙王座δ(星))【天】(星空中亮度为四等的)四等星 4 Math. an increment of a variable 【数】(变量的)增量 □ deltaic /delˈteiik/ adj.[Middle English via Greek from Phoenician daleth] |