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| 61. | commemorative envelope |
| 纪念封 |
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| 62. | nonuniform envelope |
| 非均匀包络 |
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| | |
| 63. | operating envelope |
| 作业范围 |
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| | |
| 64. | height envelope |
| 限高标准 |
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| | |
| 65. | building envelope |
| 建筑物外壳 |
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| | |
| 66. | velocity envelope |
| 限速标准 |
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| | |
| 67. | signal envelope |
| 信号包络 |
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| | |
| 68. | nuclear envelope |
| 核被膜，核包膜 |
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| | |
| 69. | peripheral envelope |
| 周包膜 |
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| | |
| 70. | polychrist envelope |
| 明信片式信封 |
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