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| 71. | 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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| 72. | Studying on our own brings the most knowledge. |
| 自己钻研可带来最多的知识。 |
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| 73. | 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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| 74. | He broke into our conversation several times. |
| 他老是在钻研词的起源。 |
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| 75. | The players are concentrating their minds on listening to the coach. |
| 队员们正聚精会神地听教练讲课。 |
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| 76. | Sue has studied so much philosophy this year |
| 今年苏钻研哲学下了不少功夫， |
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| 77. | He was still investigating, still questioning. |
| 他依然在钻研，依然在探究。 |
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| 78. | The book was the result of ten years of assiduous research. |
| 那本书是十年苦心钻研的成果。 |
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| 79. | 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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| 80. | I smoked with concentration and pleasure, |
| 我聚精会神而又愉快地吸着这枝烟。 |
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