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1. | Parallel lines never join. |
| 平行线永不相交。 |
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2. | pseudo-parallel lines |
| 伪平行线 |
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3. | parallel line assay |
| 平行线测定 |
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4. | parallel-line oscillator |
| 平行线振荡器 |
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5. | parallel lines of fire |
| 射击平行线 |
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6. | radial-parallel search |
| 径向线平行线搜索 |
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7. | Parallel wire |
| 平行线 |
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8. | pencil of parallel lines |
| 平行线束 |
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9. | geodesic parallel |
| 测地平行线 |
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10. | Parallel lines converge at infinity. |
| 平行线永不相交. |
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