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| 41. | para orientation |
| 对位取代 |
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| 42. | mercury replacement |
| 汞取代 |
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| 43. | substituting effect |
| 取代效应 |
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| 44. | degree of substitution |
| 取代度 |
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| 45. | triple substitution |
| 三元取代 |
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| 46. | indirect substitutio |
| 间接取代 |
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| 47. | ion substitution |
| 离子取代 |
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| 48. | isotopic substitutio |
| 同位素取代 |
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| 49. | direct substitution |
| 直接取代 |
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| 50. | normal substitution |
| 正常取代 |
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