27“对称”是宇宙间的普遍法则吗？

答：否，宇宙间有严格对称事物和概率（大致）对称事物，也同时有不对称事物。各举一例：作用力反作用力严格对称；动、植物某些形体特征大致对称；时间进程不对称（见《L17a现代物理基础理论的系统性“问题”》文）。具体事物是否对称需具体分析。 

21 does “symmetry” is the general law of universe?

Answer：no, there are strict symmetrical thing、probability (roughly) symmetrical thing in the cosmos, and exist the un-symmetrical thing at the same time．Each raising one example：acting force is strict symmetry with anti-acting force；the shape of some animal、plant is rough symmetry；the time progress is un-symmetrical (see also in article《L17aSystematic “problem” of basic theories of modern physics》) if the specific think is symmetry need do specific analysis