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
现象: appearance (of things); phenomenon 短语和例子自然现象 natural phenomenon; 社会现象 social phenomenon; 向不良现象作斗争 combat unhealthy phenomena; 暂时现象 transient phenomenon; 日[月]食是一个有趣的现象。 an eclipse is an int