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| 电子束聚焦 | |||
| 射束聚焦 | |||
| 光束聚焦; 束聚焦; 射线束聚焦; 焦点相合; 对光 | |||
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| 射束聚焦的 | |||
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beam- focusing : 11 phrases in 5 subjects |
| Air defense | 1 |
| Chemistry | 1 |
| Electronics | 4 |
| Optics branch of physics | 1 |
| Technology | 4 |
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