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41. | an everyday occurrence |
| 日常之事 |
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42. | mandatory occurrence report |
| 强制性事故报表 |
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43. | occurrence of damage |
| 发生损害 |
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44. | state of occurrence |
| 事故发生所在地国 |
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45. | occurrence of event |
| 事件的出现 |
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46. | station occurrence book |
| 消防局记事簿 |
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47. | operator-applied occurrence |
| 算符应用性出现 |
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48. | an unfortunate occurrence |
| 不幸事件. |
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49. | joint occurrence matrix |
| 共生矩阵 |
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50. | set occurrence selection |
| 集值选择 |
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