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51. | symmetrical beam |
| 对称束 |
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52. | beam tilt angle |
| 束倾角 |
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53. | bombarding beam |
| 轰击束 |
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54. | decorative hairpin |
| 束发针 |
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55. | corrective beam |
| 校正束 |
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56. | solitary tract of medulla oblongata |
| 孤束 |
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57. | pencil of forms |
| 形束 |
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58. | descending tract |
| 下行束 |
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59. | pencil of parallel lines |
| 平行线束 |
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60. | antiproton beam |
| 反质子束 |
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