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41. | activity termination |
| 活动终止 |
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42. | activity learning |
| 活动学习 |
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43. | activity longitude |
| 活动经度 |
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44. | double activity |
| 双重活动性;双重活度 |
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45. | activity measurement |
| 放射性活度测量 |
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46. | activity scanning |
| 活动扫描 |
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47. | activity rhythm |
| 活动节律 |
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48. | activity vector |
| 活动向量 |
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49. | activity sandsidy |
| 活化砂 |
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50. | liquefying activity |
| 液化力 |
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