Cardboard or stiff paper refers to paper that is thicker and firmer than ordinary paper, used for packaging, covers, or boxes.
硬纸是指比普通纸张更厚实、更坚硬的纸板，用于包装、封面或盒子。
| Chinese | 硬纸 |
|---|---|
| English | cardboard, stiff paper |
| Pinyin | ying4 zhi3 |
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