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| 21. | negative direction |
| 逆向, 反方向 |
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| 22. | in reverse counting |
| 逆向计数 |
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| 23. | reversed erosion |
| 逆向侵蚀 |
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| 24. | reverse pumping |
| 逆向泵送 |
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| 25. | retrograde ejaculation |
| 逆向射精 |
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| 26. | traction shovel |
| 牵引式挖土机|牵引铲 |
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| 27. | retrograde rotation |
| 逆向旋转 |
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| 28. | playing scales in contrary motion. |
| 逆向弹奏音阶. |
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| 29. | antiparallel line |
| 逆向平行线 |
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| 30. | back ampere-turns |
| 逆向安匝 |
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