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| 51. | It is difficult to know obscurity and manifestation |
| 晦显难知 |
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| 52. | machining of difficult-to-cut metals |
| 难加工金属材料的切削 |
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| 53. | a stiff (difficult) piece of work |
| 一件难做的工作 |
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| 54. | It is difficult to pass a dangerous course |
| 险道难渡 |
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| 55. | a book that is difficult (or hard ) to find. |
| 然而Difficult一词在需要技术独创性的情况下，常会被使用： |
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| 56. | It is difficult to manage an unbroken horse |
| 朴马难驭 |
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| 57. | The Breach of a dike is difficult to fill up |
| 决口难填 |
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| 58. | The more alternative,the more difficult the choice. |
| 选择越多越难抉择。 |
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| 59. | A new-Born colt is difficult to control |
| 草驹难制 |
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| 60. | Automatic Control System is not difficult to read . |
| 《自动控制系统》并不难读懂。 |
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