by短语在句子中的成分

TOPO is featured by high stability

is featured by 是个固定搭配，但根据英语语法来讲，不是非常理解这个by high stability在句子中的成分。

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。

这是英语中少有些等式（主动被动一个样）：
A features B. = A is featured by B.
意思：A事物以B为特点 = A事物的特点由B体现，或体目前B上。

比如：

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