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| 41. | A fire of undetermined origin. |
| 不明来源的火 |
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| 42. | A person of indeterminate age. |
| 一个年龄不明的人 |
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| 43. | FUO(Fever of Undetermined Origin) |
| 原因不明的发热 |
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| 44. | land of uncertain ownership |
| 所有权不明的土地 |
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| 45. | unexplained infertility |
| 原因不明性不孕 |
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| 46. | His disappearance is unaccounted for. |
| 他失踪原因不明. |
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| 47. | We call meanness nobility and hatred honor. |
| 我们善恶不分，是非不明。 |
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| 48. | These were uncharted waters. |
| 这些水域深浅不明。 |
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| 49. | His motives lay hidden. |
| 他的动机不明。 |
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| 50. | doubtful operation |
| 原因不明的动作 |
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