A character can be defined as a unit of information that corresponds to an atomic unit in a written language.

可以将字符定义为一个信息单元，对应于书面语言的一个原子单元。

youdao

Taking the hydrogen atom as an example, the author designs a precise, speedy and convenient application program to draw the atomic orbital and electronic cloud with MATLAB language.

以氢原子为例，以MA TLAB为程序开发语言，设计了一种精确、快速、简便地绘制原子轨道和电子云图形的应用程序。

youdao

(Sound) Iran's English-language Press TV reports that International Atomic Energy Agency inspectors are beginning a three-day visit to Iran,Saturday, to examine the country's Fordoo nuclear enrichment facility.

VOA: standard.2009.10.24