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41. | The light beam passes through the container holding the vapor. |
| 光束通过盛蒸汽的容器。 |
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42. | optical beam riding |
| 光束制导 |
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43. | beam wobbling |
| 光束摆动 |
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44. | frequency-modulated beam |
| 调频光束 |
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45. | OBject beam |
| 物体光束 |
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46. | illuminating beam |
| 照射光束 |
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47. | beam propagation |
| 光束传播 |
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48. | optical beam expander |
| 光束扩张器 |
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49. | commutating optical beam |
| 转换光束 |
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50. | optical beam splitter |
| 光束分光镜 |
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