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| 布居反转; 粒子数布居反转 | |||
| 粒子数〔集居数，占有数〕反转 | |||
| 粒子数反转 | |||
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population inversion : 4 phrases in 3 subjects |
| Physics | 1 |
| Space | 2 |
| Technology | 1 |
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