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| 31. | envelope material |
| 裹料 |
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| | |
| 32. | envelope chemise |
| 筒型女式内衣 |
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| 33. | envelope demodulatio |
| 包络解调 |
|
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| | |
| 34. | envelope viewer |
| 包线指示器|包络观察器 |
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| | |
| 35. | envelope detection |
| 包络线检测 |
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| 36. | envelope machine |
| 制信封机 |
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| 37. | envelope detector |
| 包线检波器 |
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| 38. | envelope select |
| 包络选择 |
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| 39. | envelope glissette |
| 推成包络 |
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| | |
| 40. | penalty envelope |
| 免费邮递公文的信封 |
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