TOPO is featured by high stability.
按被动语态理解，by 引出动作（feature）的施事者，介词短语作状语。
按系表结构理解，by 介词短语作形容词 featured 的补足语；或者把整个featured by high stability 看作表语。

这是英语中少有的等式（主动被动一个样）：
A features B. = A is featured by B.
意思：A事物以B为特色 = A事物的特色由B体现，或体现在B上。

例如：

The original version featured a guitar solo.
原版以吉他独奏为特色。
《柯林斯英汉双解大词典》
=The original version was featured by a guitar solo.