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| 11. | R.F. envelope |
| 射频脉冲宽度 |
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| 12. | A few of the books have torn jackets. |
| 少数的书的封皮破了 |
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| 13. | The hard cover of a book. |
| 封皮纸板用作书封面的硬纸板 |
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| 14. | floral envelope |
| 【植】花被 |
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| 15. | The cover that holds together the pages of a book. |
| 封皮把书叶聚在一起的外皮 |
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| 16. | Temperature envelope |
| 温度范围 |
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| 17. | window envelope |
| 开窗信封(正面部分透明, 可见信纸上的收信人的地址) |
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| 18. | Pulse envelope |
| 脉冲包络 |
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| 19. | envelope roulette |
| 旋动包络 |
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| 20. | electron envelope |
| 电子壳层 |
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