irreducible adjective  formal uk/ˌɪr.ɪˈdʒuː.sə.bəl/ us/ˌɪr.əˈduː.sə.bəl/
    不能减缩的;不可简化的impossible to make smaller or simpler
    A few simple shapes are the irreducible forms from which all of the patterns are generated. 一些简单的形状不可简化,所有图案都是由这些形状构成的。 
     Related word: irreducibly