Info: Should the corresponding noun is in the plural, the indefinite write-up is omitted, since it can not Specific a larger quantity. This behaviour is analogous to the rules in English grammar: 最简单的说法，即是在最原始的集合论。集合是把人们的直观的或思维中的某些确定的能够区分的对象汇合在一起，使之成为一个整体或称为单体，这一整体就是集合。 Our goal is always to bring you closer to ... https://bihlmayermedia-bilder.com/1-advent/