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| 71. | a hard nut to crack: |
| 难题；难对付的人 |
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| -- 来源 -- 英语惯用法100(2) - Part 64 Being Difficult |
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| 72. | a tangled skein of problems |
| 盘根错节的一堆难题 |
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| 73. | 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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| 74. | A difficult problem or question. |
| 难题，令人费解的问题 |
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| 75. | our number one difficulty |
| 我们最大的难题 |
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| 76. | He broke into our conversation several times. |
| 他老是在钻研词的起源。 |
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| 77. | 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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| 78. | a sphinx riddle |
| 怪谜;[喻]难题 |
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| 79. | They have quite a problem. |
| 他们的确有难题。 |
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| 80. | difficult puzzle or problem |
| 棘手的事;难题 |
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