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| 81. | difficulty test |
| 难度测验 |
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| 82. | medium difficulty |
| 中等难度 |
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| 83. | slight difficulty |
| 小困难 |
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| 84. | test difficulty |
| 测验难度 |
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| 85. | learning difficulty |
| 学习困难 |
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| 86. | difficulty score |
| 难度分数 |
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| 87. | economic difficulty |
| 经济困难;经济困难 |
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| 88. | Change difficulty |
| 改变难易度 |
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| 89. | difficulty arise |
| 困难产生 |
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| 90. | physical difficulty |
| 具体的困难 |
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