This is the 2668th most frequent Japanese word.
段ボール
Corrugated cardboard.
In this sentence, '段ボール' is used to refer to cardboard boxes as physical objects or containers.
部屋には段ボールがたくさん積み上げられていた。
There were many cardboard boxes piled up in the room.
Here, '段ボール' is used to signify the cardboard material itself, ready for crafting or cutting.
この段ボールで新しい工作を作ることができます。
You can create a new craft using this cardboard.
In this instance, '段ボール' represents the concept of the material in general terms, emphasizing ecological practices.