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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. | 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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43. | 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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44. | 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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45. | While she was studying physics, he began to dig into physical chemistry |
| 她在研究物理学时,他开始钻研物理化学。 |
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46. | He broke into our conversation several times. |
| 他老是在钻研词的起源。 |
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47. | 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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48. | He is delving deeply into all aspects of the subject |
| 他正在深入钻研这个题目的各个方面。 |
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49. | 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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50. | She has been wrestling with this subject for two hours. |
| 她钻研这个问题已经两个小时了。 |
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