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| 41. | the complexities of higher mathematics |
| 高等数学的难题. |
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| 42. | 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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| 43. | 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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| 44. | do+ [ 1 ] a puzzle |
| 解谜;解决难题 |
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| 45. | They dug into the history of mankind. |
| 他们苦心钻研人类的历史。 |
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| 46. | I have a problem. |
| 我有难题。 |
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| 47. | To plunge into an activity or enterprise with vigor and gusto. |
| "全身的投入,潜心钻研,探究." |
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| 48. | That' s a hard nut to crack. |
| 那是一个难题。 |
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| 49. | That was a hard question. |
| 那是一道难题 |
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| 50. | in difficulty ties |
| 困难,困境,难题 |
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