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| 51. | double island arc |
| 双重岛弧 |
|
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| | |
| 52. | double confounding |
| 双重混杂 |
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| | |
| 53. | double coverage |
| 双重覆盖 |
|
|
| | |
| 54. | Substitutio duplex |
| 双重替补 |
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| | |
| 55. | double exchange |
| 双重交换 |
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| | |
| 56. | double indemnity |
| 双重保险 |
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| | |
| 57. | double flange rings (reversible type) |
| 双重密封圈 |
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| | |
| 58. | double thinking |
| 双重思维 |
|
|
| | |
| 59. | double governor |
| 双重调节器 |
|
|
| | |
| 60. | dual supervision |
| 双重监督 |
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| | |