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| 51. | dual-beam observatio |
| 双束观测 |
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| 52. | beam limiting device |
| 限束器 |
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| 53. | beam self focusing |
| 射束自聚焦 |
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| 54. | narrow beam absorption |
| 窄束吸收 |
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| 55. | beam spot diameter |
| 束斑直径 |
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| 56. | beam-plasma instability |
| 束－等离子体不稳定性 |
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| 57. | beam spot stretch |
| 束点扩展 |
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| 58. | molecular beam spectra |
| 分子束光谱 |
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| 59. | beam-foil technique |
| 束箔技术 |
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| 60. | molecular beam spectroscopy |
| 分子束光谱学 |
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