| 释义 |
四级sìjígrade 4fourth classcategory D四级 sì jí level Four; Band Four; Fully Good 四级胺 quaternary ammonium compound; 四级蛋白质结构 quarternary protein structure; 四级电离 {物} quarternary ionization; 四级风 force 4 wind; moderate breeze; 四级火箭 fourstage rocket; 四级结构 quaternary structure; 四级精度 rough grade; 四级考试 Band Four Test; 四级四元数 quadriquaternion四级a.fourth-class四级的，丁等的phr.fourth class四级，丁等四级quaternary |