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| 21. | He still worked at his biology. |
| 他仍然钻研他的生物学。 |
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| 22. | You should get up the history |
| 你应该钻研一下历史。 |
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| 23. | To search deeply and laboriously: |
| 钻研深入刻苦地研究： |
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| 24. | The young worker dug into Lu Xun's works. |
| 这位青年工人钻研鲁迅的著作。 |
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| 25. | He is going in for marine biology |
| 他在钻研海洋生物学。 |
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| 26. | He has honestly studied history. |
| 他实实在在地钻研历史。 |
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| 27. | The man up on robotics. |
| 这个人钻研机器人技术。 |
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| 28. | We pored over the sketches for a long time. |
| 我们花了很长时间钻研素描。 |
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| 29. | He is at grips with civil architecture. |
| 他在钻研民用建筑学。 |
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| 30. | They dug into the history of mankind. |
| 他们苦心钻研人类的历史。 |
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