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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. | nuclear envelope |
| 核被膜,核包膜 |
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54. | polychrist envelope |
| 明信片式信封 |
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55. | peripheral envelope |
| 周包膜 |
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56. | signal envelope |
| 信号包络 |
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57. | operating envelope |
| 作业范围 |
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58. | velocity envelope |
| 限速标准 |
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59. | stapled envelope |
| 钉针封 |
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60. | envelope airship |
| 飞船蒙皮 |
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