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| 密度起伏 | |||
| 密度波动 | |||
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| 密度起伏; 密度波动 | |||
| 密度涨落; 密度变化 | |||
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density fluctuations : 10 phrases in 3 subjects |
| Electronics | 2 |
| Polymers | 1 |
| Technology | 7 |
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