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| 41. | two-way channel |
| 双向信道 |
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| 42. | bilateral hinge |
| 双向铰链 |
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| 43. | reversible disc plough |
| 双向圆盘犁 |
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| 44. | doubly linked list |
| 双向链表 |
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| 45. | bi directional movement |
| 双向移动 |
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| 46. | two-way amplifier |
| 双向放大器 |
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| 47. | two-action line |
| 双向传输线 |
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| 48. | double image lens |
| 双向透镜 |
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| 49. | two-course beacon |
| 双向信标 |
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| 50. | amphicheiral knot |
| 双向纽结 |
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