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| 41. | slow electron bombardment |
| 慢电子轰击 |
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| 42. | electron impact ion source;EI source |
| 电子轰击离子源 |
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| 43. | electron bombardment furnace |
| 电子轰击炉 |
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| 44. | Which way is the business part?" |
| 商业区在哪里？” |
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| 45. | To irradiate(an atom. |
| 轰击放射（原子） |
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| 46. | fast atom bombardment(FAB) |
| 快速原子轰击 |
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| 47. | electro-bombardment melting |
| 电子轰击熔炼 |
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| 48. | go [ live ] downtown |
| 去[住在]商业区 |
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| 49. | electron impact desorption(EID) |
| 电子轰击解吸 |
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| 50. | The shopping section of a city |
| 城市的商业区 |
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