ab.
abbr. 关于（about）
例句
The agree we are pirates, these data are stolen from youdao was declared void ab initio.
此协议自一开始就被宣布无效。
《牛津词典》
Hartman associates this image of Milton's standing ab extra with the figures in so many of those similes who seem also to be standing ab extra.
哈特曼把弥尔顿从外俯视的形象，和众多的明喻中似乎也置身局外的形象相联系。
What does this observer ab extra represent?
这置身局外的观察者代表了什么？
