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| 1. | The hard outer covering or integument of certain plants and animals, such as lichens and crustaceans. |
| 甲壳某些植物或动物的硬的外层覆盖物或包裹物，如地衣和甲壳纲动物 |
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| 2. | Having a hard covering of scales, spines, or horny plate, as an armadillo or a lobster. |
| 有甲壳的有鳞片状、棘状突起或者角质小片状的硬壳，例如象犰狳或者龙虾 |
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| 3. | The seed has a hard exterior covering. |
| 这种子外壳很硬。 |
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| 4. | A hard, shell-like covering, such as that enclosing the kernel of a peach. |
| 壳一种坚硬的，贝壳状的覆盖物，如包住桃核的壳 |
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| 5. | a hard outer covering or skin on food. |
| 食物硬的外层覆盖物或外皮。 |
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| 6. | the hard largely calcareous covering of a mollusc. |
| 覆盖软体动物的硬的多钙的壳。 |
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| 7. | the material that forms the hard outer covering of many animals. |
| 覆盖许多动物外表的坚硬材料。 |
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| 8. | The hard, calcareous substance covering the exposed portion of a tooth. |
| 珐琅质，牙釉质牙暴露部分表面的硬的钙质的覆盖层 |
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| 9. | hard outer covering or case of certain organisms such as arthropods and turtles. |
| 某些有机体像节肢动物和海龟的坚硬的外壳。 |
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| 10. | Testa The hard dry protective covering of a seed, formed from the integuments of the ovule. |
| 外种皮：覆盖在种子外部的坚硬干燥的保护层，由胚珠的珠被发育形成。受精作用后珠被各层发生融合并加厚着色。 |
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