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。
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。
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。
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。
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。
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。
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。
Of course, biological control agents can safely be released only if it can be verified that they feed solely on the target weed.
当然，只有能够证明它们仅以目标杂草为食，生物控制剂才能安全释放。
You are allowed to get access to our computer system only if you get the manager's permission.
只要得到经理的许可，你就可以使用我们的电脑系统。
Where the penalties are not a must, they should be imposed only if the facts of a case support it.
如果惩罚不是必须的，那么只有在该案件有事实支持的情况下才应该施加惩罚。
Honey made from such nectar can cause the effects the texts describe, but only if eaten fresh since the honey loses its toxicity within a few weeks of being made.
用这种花蜜制成的蜂蜜会产生书上所描述的效果，但只有在新鲜食用的情况下才会如此，因为蜂蜜在制作几周内就会失去毒性。
Dark patterns also can be addressed on a self-regulatory basis, but only if organizations hold themselves accountable, not just to legal requirements but also to industry best practices and standards.
黑暗模式也可以在自我监管的基础上得到解决，但前提是各组织要自己担负起责任，不仅要遵守法律要求，还要遵守行业最佳实践和最高标准。
Only if non-OPEC nations, including Norway, Mexico, and Russia, were to trim output by a total of 500,000 barrels a day.
除非挪威、墨西哥和俄罗斯等非欧佩克国家将日产量总计削减50万桶。
Agrillo's team found that mosquitofish can discriminate between numbers up to 16, but only if the ratio between the fish in each shoal was greater than 2:1.
阿格利罗的团队发现，食蚊鱼最多可以分辨大到16的两个数字的大小，但前提是每个鱼群中鱼的比例大于2:1。
Parents end up treating tablets as precision surgical instruments that might perform miracles for their child's IQ and help him win some great robotics competition but only if they are used just so.
父母们最终把药片当作精密的外科手术器械，这种器械可能会为孩子的智商创造奇迹，帮助他在一些大型机器人竞赛中获胜，但前提是它们的使用要恰当。
Only if schools, families and students join hands together, can students get enough sleep and be at their best in schoolwork.
只有学校、家庭和学生齐心协力，学生才能有充足的睡眠，在学业上发挥最佳状态。
If you're standing nearby, the birdhouse will also give you a free Wi-Fi connection—but only if pollution level is low enough.
如果你站在附近，鸟舍也会给你免费 Wi-Fi 连接，但前提是污染水平得足够低。
Peretti says the Times shouldn't waste time getting out of the print business, but only if they go about doing it the right way.
佩雷蒂说，《纽约时报》不应该把时间浪费在终止印刷业务上，而应该采取正确的方式去解决这件事。
"Only if we discuss the consequences of our biophysical limits," the December warning letter says, "can we have the hope to reduce their speed, severity and harm."
12月的警告信中写道：“只有当我们讨论生物物理极限的后果时，我们才有希望降低其速度、严重性和危害。”
To keep hope is the best weapon for victory, so never tell yourself "nothing" because only if you try to search, you can always find a "pear" to pull you out of trouble.
保持希望是取得胜利的最好武器，所以永远不要告诉你“什么都没有”，因为只要你努力寻找，你总能找到一个“梨”把你从困境中拉出来。
This is true as the above derivation for a and b of opposite parity is an if and only if statement.
这是正确的，因为上面对a和b 的奇偶性的推导是一个当且仅当命题。
The arbitral tribunal shall decide as amiable compositeur or ex aequo et bono only if the parties have expressly authorised the arbitral tribunal to do so.
只有得到当事人明示的授权，仲裁庭才可以根据公平的原则作出裁决。
The arbitral tribunal shall decide as amiable compositeur only if the parties have authorised the arbitral tribunal to do so.
仲裁庭只有在当事各方授权的情况下，才应作出友好调剂。
Therefore, it is usable only if the record types are in the schema.
因此，只是当记录类型位于方案之中时，它才有用。
The client will send a certificate to the server only if the server requests one.
只有在服务器发出请求时，客户机才会向服务器发送一个证书。
Members from the two cubes are merged only if they have identical names.
仅当来自两个数据集的成员具有相同的名称时才会合并它们。
Only if the process stalls is an error returned.
只有当过程进行不下去时，才会返回错误。
Yet many applications validate files only if they are at least partly correct.
但是很多应用程序只有当文件至少部分正确时才进行验证。
And the workforce (W) is motivated only if it involves their current responsibilities.
职工（W）只有当涉及当前的职责时才是有动机的。
And the workforce (W) is motivated only if it involves their current responsibilities.
职工（W）只有当涉及当前的职责时才是有动机的。
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