| 51. | If a particle is moving it keeps on going in the same direction unless forces act upon it. |
| 如果一个粒子正在运动，它将沿着同一方向继续运动下去，除非有力作用其上。
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| 52. | No one shall be allowed in unless he can give the password. |
| 凡对不上口令的人将一律不准入内。
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| 53. | It is impossible to enjoy idling thoroughly unless one has plenty of work to do. (Jerome Klapka Jerome, British humorist) |
| 除非有大量的工(英国幽默家 杰罗姆.J.K.)
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| 54. | Law can nerver be enforced unless fear supports it. (Sophocles, Ancient Greek dramatist) |
| 如果法律没有恐惧支撑，它绝不能生效。(古希腊剧作家 索福克勒斯)
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| 55. | I won't go to the party unless I'm invited. |
| 除非我被邀请，否则我不会去参加晚会的。
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| 56. | I won't go to the party unless they invite me. |
| 除非他们邀请我，否则我不会参加这个晚会。
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| 57. | Unless (you are)paying by credit card, please pay in cash. |
| 除非你用信用卡付款，否则请付现金。
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| 58. | They would never do this unless compelled. |
| 除非受到强迫，否则他们绝不会做这样的事。
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| 59. | If you owe money to a man ,he may attach part of your salary unless you pay him. |
| 如果你欠某人的钱，除非你付清欠款，否则他可以申请扣留你的部分薪金。
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| 60. | Unless I miss my guess, they'll get in touch with. |
| 除非我猜错，否则他们一定会和你联系的。
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