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section; cross section; profile
木の断面から年輪を数えて樹齢を知ることができる。
You can count the rings on a cross section of wood to know the tree's age.
断面図を見ると建物の内部構造が分かる。
Looking at the cross-section diagram, you can understand the building's internal structure.
社会の断面を鋭く描いた小説が評価された。
A novel that sharply depicted a cross-section of society was praised.