But about the smell of rancid butter... There are good associations too.

坏掉的奶油……这也使我产生了许多联想。

youdao

When I think of this rancid butter I see myself standing in a little, old world courtyard, a very smelly. very dreary courtyard.

一想起这变质的奶油我就感觉到自己正站在一个小小的老式院子里，这是一个气味很难闻、很凄凉的院子。

youdao

The ocean warriors hurl rancid butter on Japanese decks, use warps to foul propellers and attempt citizen's arrests of the whaling captains.

这些海上勇士，将酸臭的黄油掷向日本船只的甲板，用船索缠住日本船只的螺旋桨，甚而欲对捕鲸船船长遂行公民逮捕之责。

youdao

They're readying black wooden fume boards--hive lids lined in absorbent black felt on which they will drizzle butyric acid, the active ingredient in rancid butter.

FORBES: Magazine Article

Later in one of the yurts I sat in a cross-legged circle with a group of guests eating balls of rancid yak butter.

BBC: Following the Silk Road to the end of China