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51. | dual supervision |
| 双重监督 |
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52. | double flange rings (reversible type) |
| 双重密封圈 |
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53. | double governor |
| 双重调节器 |
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54. | doyble refraction =birefringence |
| 双重折射 |
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55. | double indemnity |
| 双重保险 |
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56. | Substitutio duplex |
| 双重替补 |
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57. | double island arc |
| 双重岛弧 |
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58. | duplex calculating |
| 双重计算 |
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59. | double thinking |
| 双重思维 |
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60. | dual conversion |
| 双重转化 |
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