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| 21. | To search deeply and laboriously: |
| 钻研深入刻苦地研究： |
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| 22. | patterned strings problem |
| 交错线难题 交错?难题 |
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| 23. | an intricate problem |
| 难题 |
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| 24. | The man up on robotics. |
| 这个人钻研机器人技术。 |
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| 25. | I need problems. A good problem makes me come alive. |
| 我需要难题。难题令我精神抖擞。 |
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| 26. | You should get up the history |
| 你应该钻研一下历史。 |
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| 27. | We addressed ourselves vigorously to this problem. |
| 我们奋力钻研这一问题。 |
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| 28. | He is going in for marine biology |
| 他在钻研海洋生物学。 |
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| 29. | He has been delving into Chinese folklore for many years |
| 多年来他一直在钻研中国民俗。 |
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| 30. | He is at grips with civil architecture. |
| 他在钻研民用建筑学。 |
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