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| 51. | bidirectional pulse train |
| 双向脉冲序列 |
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| 52. | reversible pump |
| 双向泵 |
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| | |
| 53. | bidirectional bar code |
| 双向条码 |
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| 54. | both-way trunk line |
| 双向中继线 |
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| 55. | bidirectional coupler |
| 双向耦合器 |
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| 56. | bidirectional optical cable |
| 双向光缆 |
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| 57. | bidirectional drive |
| 双向传动 |
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| 58. | bidirectional shearer |
| 双向采煤机 |
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| | |
| 59. | bidirectional line |
| 双向线 |
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| | |
| 60. | bilateral servo-mechanism |
| 双向伺服机构 |
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