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| 21. | multi-way service pipe system |
| 双向供水 |
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| 22. | bilateral tolerance |
| 双向公差 |
|
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| | |
| 23. | bilateral transducer |
| 双向换能器 |
|
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| | |
| 24. | reversible tractor |
| 双向拖拉机 |
|
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| | |
| 25. | duplex printing |
| 双向印刷 |
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| | |
| 26. | double-way connection |
| 双向连接 |
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| 27. | either-rotation motor |
| 双向电机 |
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| | |
| 28. | both-way operation |
| 双向操纵 |
|
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| 29. | double-sided socket |
| 双向插座 |
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| 30. | reversing motor |
| 双向电动机 |
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