第一基本形式
dì​yī​jī​běn​xíng​shì

first fundamental form

  1. 第一 dì​yī numeral
    first
    occupying the lead position in a sequence, order, or ranking; the first
  2. 基本 jī​běn adjective
    basic
    basic; fundamental; essential; primary; main; serving as a root or foundation
  3. 形式 xíng​shì noun
    form
    the external manner, style, or method of presentation, especially as contrasted with content 内容 nèi​róng; formal