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| |||
| envelope (curve) | |||
| envelope; envelope curve | |||
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| envelope | |||
| envelope curve | |||
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包 迹 : 63 phrases in 11 subjects |
| Air defense | 1 |
| Artificial intelligence | 1 |
| Aviation | 3 |
| Earth sciences | 1 |
| Economy | 2 |
| Electronics | 1 |
| Geology | 1 |
| Oil / petroleum | 2 |
| Radio | 1 |
| Technology | 15 |
| Textile industry | 35 |
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