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1·They are dangerous only if programmers are careless.

只有当程序员粗心大意时，它们才是危险的。

2·But only if they operate at near capacity, otherwise, their overall efficiency is poor.

但只能是在它们接近满负荷运转的情况下，否则整体效率就会很低。

3·Eye of newt goes into the little black bag, if and only if there is reproducible scientific evidence that it works.

当且仅当有可重复的科学证据证明蝾螈之眼有效时，蝾螈之眼才会进入小黑袋中。

4·The first draft will appear on the page only if you stop avoiding the inevitable and sit, stand up, or lie down to write.

只有当你不再回避不可避免的事情，而是坐着、站着或躺着写作时，初稿才能跃然纸上。

5·That would be true only if you believed that patients should have an unrestrained right to treatments proven to be inferior.

只有当你认为患者有权不受限制地享有已证劣等治疗时，这才是正确的。

6·Problems occur only if a contradiction develops between a new observation, say, That ball is blue, and the preexisting statements.

只有当一个新的观察，比如“那个球是蓝色的”，与已有的陈述之间产生矛盾时，才会出现问题。

7·Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises.

因为温暖的空气比冷空气能容纳更多的湿气，所以只有当大气中的水蒸气量随着温度的升高而增加时，相对湿度才会保持不变。

8·The lawyer is paid only if he wins.

律师只有打赢官司才会被付费。《柯林斯英汉双解大词典》

9·Children are admitted only if accompanied by an adult.

儿童必须有成年人陪同方可入场。《牛津词典》

10·Only if the red light comes on is there any danger to employees.

只有红灯闪亮时才有危及职工的险情。《牛津词典》

只有

1·The lawyer is paid only if he wins.

律师只有打赢官司才会被付费。《柯林斯英汉双解大词典》

2·Only if the red light comes on is there any danger to employees.

只有红灯闪亮时才有危及职工的险情。《牛津词典》

3·That theory held true only if the demand for money was stable.

那一理论只有在货币需求是稳定的时候才正确。

4·Money can make you happy, only if you spend it in a clever way.

只有在你聪明地花钱时，钱才会使你感到快乐。

5·Where the penalties are not a must, they should be imposed only if the facts of a cast support it.

如果处罚不是必须的，则只有在有事实支持的情况下才应施加处罚。