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| 1. | They periodically thinned out leaves. |
| 他们定期打掉一些叶子。 |
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| 2. | periodically distorted lattice |
| 周期畸变点阵 |
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| 3. | periodically changing potential |
| 周期变化势 |
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| 4. | one of a series published periodically. |
| 定期发行的杂志中的其中一册。 |
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| 5. | periodically operated switch |
| 周期动作开关 |
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| 6. | The streets are periodically scavenged. |
| 定期街道清理 |
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| 7. | periodically accumulated over time. |
| 随着时间的过去定期性的积聚。 |
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| 8. | New strains of viruses appear periodically. |
| 新菌系的细菌周期性地产生 |
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| 9. | neutropenia that occurs periodically. |
| 周期性发生的嗜中性白血球减少症。 |
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| 10. | Hurricanes periodically menace the Gulf Coast. |
| 飓风常常威胁着墨西哥湾海岸。 |
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