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51. | dendritic markings |
| 师状痕迹 |
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52. | arc striking mark |
| 电焊打火痕迹 |
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53. | bear some trace (s) |
| 带有某些痕迹 |
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54. | erase pencil marks |
| 擦掉铅笔痕迹。 |
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55. | electrochemical trace analyzer |
| 电化学痕迹分析仪 |
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56. | These marks won't rub off. |
| 这些痕迹擦不掉。 |
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57. | memory trace |
| 记忆痕迹(心理学) |
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58. | machining marks |
| 机械加工痕迹 |
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59. | the imprint of suffering |
| 苦难的痕迹 |
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60. | The trace is clear |
| 痕迹甚显 |
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