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| 21. | wave line of propagation |
| 波的传播方向;波的方向 |
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| 22. | In this way, our sciences will progress faster. |
| 朝这个方向走，我们的科学事业的发展就可以快一些。 |
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| 23. | One Direction;Both Directions (default up);Both Directions (default down) |
| 一个方向;两个方向（默认向上）;两个方向（默认向下） |
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| 24. | A change in direction;a swerve. |
| 转向方向的转变；转向，偏离方向 |
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| 25. | directional stick circuit |
| 方向保留电路|方向自闭电路 |
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| 26. | orientation of related features |
| 关连形体间的方向|方向公差 |
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| 27. | is the original piano on which the composer created some of his greatest works.就是在这架钢琴上,这位作曲家创作出了他的一些伟大的作品 |
| 最初的,最早的;原版的,原物的.指按顺序是首位的,在此前不再有更为原始的同类的东西;也指原件的,原物的,非仿造的东西. |
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| 28. | direction of wave travel |
| 波传播方向;波的传播方向 |
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| 29. | across track aiming |
| 垂直于航迹方向的瞄准|方向瞄准 |
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| 30. | The direction of conventional current flow is counterclockwise. |
| 传统的电流方向是逆时针方向。 |
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