对称: symmetry; symmetrical 短语和例子放射对称 radial symmetry; 镜面对称 mirror symmetry; 左右对称 bilateral symmetry; 大楼的两翼完全对称。 the two wings of the building are exactly symmetrical.; 对称比 cylindricizing; 对称变换
叉: 叉动词[方言] (挡住, 卡住) block up; jam 短语和例子河道被冰块叉住了。 the river is blocked up with ice. 游行队伍把路口全都叉住了。 traffic was completely held up by the procession [paraders].
