| 41. | Unless the two countries soon reach an understanding, there will be war. |
| 除非两国立即达成协议,否则将会发生战争。
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| 42. | This knife is unless for cutting bread. |
| 这把刀子不能用来切面包。
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| 43. | We shall never be able to fulfil ourselves truly unless we are working for the welfare of our fellows. |
| 我们只有为同胞的利益而工作才能真正充分发挥我们自己的才能。
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| 44. | Unless the floods go down we shan't be able to use the ford. |
| 除非洪水下降，否则我们便无法利用这个津渡。
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| 45. | Unless the object is properly focused the photograph will be blurred. |
| 除非把焦距调准，否则拍出来的照片将是模糊不清的。
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| 46. | It immediately ran away when she saw it, and experts confirmed that a puma will not attack a human being unless it is cornered. |
| 那里的一位妇女在采摘黑莓时的看见“一只大猫”，离她仅5码远，她刚看见它，它就立刻逃走了。
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| 47. | You play to win, and the game has little meaning unless you do your utmost to win. |
| 参加比赛就是为了取胜。如果不拚命去赢，比赛就没有什么意义了。
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| 48. | Most children have such a high ideal of their parents, unless the parents themselves have been unsatisfactory, that it can hardly hope to stand up to a realistic evaluation. |
| 除非父母自身不能令人满意，大多数孩子对父母估价过高，以致这种估价很难指望经受住现实的考验。
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| 49. | Ice is only as safe as the water from which it is made, and should not be put in drinks unless it is known to be safe. |
| 冰块只有当制造冰块的水安全时才是保险的，只有知道冰块安全时才能加入饮料。
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| 50. | Normal people tend to forget this process unless and until they are reminded of it. |
| 衰老的过程，不经提起，正常人容易忘记；一经提醒，才会记起。
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