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| 51. | commemorative envelope |
| 纪念封 |
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| 52. | height envelope |
| 限高标准 |
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| 53. | stapled envelope |
| 钉针封 |
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| 54. | nuclear envelope |
| 核被膜，核包膜 |
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| 55. | nonuniform envelope |
| 非均匀包络 |
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| 56. | velocity envelope |
| 限速标准 |
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| 57. | signal envelope |
| 信号包络 |
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| 58. | peripheral envelope |
| 周包膜 |
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| | |
| 59. | operating envelope |
| 作业范围 |
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| 60. | polychrist envelope |
| 明信片式信封 |
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