ruminant|ruminants

她沉思的神情表明她正在深入思考这个问题。

Her ___ruminant expression showed she was deeply pondering the issue.

山羊是反刍动物，它们有四个胃室。

Goats are ___ruminants with four-chambered stomachs.

她像反刍动物一样反复思考着那个决定，迟迟无法下定决心。

She acted like a ___ruminant, endlessly chewing over that decision without reaching a conclusion.