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| 41. | Why do you hammer at the subject day after day? |
| 你为何日复一日地钻研那个科目? |
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| 42. | He spent hours poring over the statistics. |
| 他花了数小时钻研这些统计数据。 |
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| 43. | When studying, he focused his attention on his lessons. |
| 学习时，他聚精会神地钻研功课。 |
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| 44. | The book was the result of ten years' assiduous research. |
| 那本书是十年苦心钻研的成果. |
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| 45. | He burrowed into reference books for research data. |
| 他查阅 [钻研] 参考书籍寻求研究资料。 |
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| 46. | Studying on our own brings the most knowledge. |
| 自己钻研可带来最多的知识。 |
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| 47. | He seems to spend most of his time swotting up. |
| 他好像大部分时间都在苦学钻研。 |
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| 48. | He delved into lots of old books for the facts. |
| 他钻研大量古书，查考那些事实。 |
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| 49. | He was still investigating, still questioning. |
| 他依然在钻研，依然在探究。 |
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| 50. | Being busily engaged in study, Professor Smith sported his door. |
| 史密斯教授忙于钻研学问，他闭门谢客。 |
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