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empty level; unfilled level | |||
unoccupied level | |||
empty state (энергетический); unfilled state; unoccupied state; vacant state | |||
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empty energy level; unfilled energy level |
незаполненный уровень: 10 phrases in 4 subjects |
Makarov | 3 |
Nanotechnology | 1 |
Packaging | 3 |
Technology | 3 |