only if

释义

只要…就；只有，只有当…；除非；

英英释义

only if

adv.never except when

同义词：onlyonly when

同近义词辨析

if only但愿，希望，标示一种强烈的愿望，后接虚拟语气

only if只有在……的时候，表示对条件的强调

as if好像，仿佛，表比较

even if及时，表让步

双语例句

用作连词(conj.)

The sale will only go ahead if the serial numbers match.
只有当序号都相符合时，销售才能继续进行。

The only time to dress up is when your jeans are dirty.
只有当你的牛仔裤变脏的时候你才会去打扮一下。

权威例句

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。

youdao

2. 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。

youdao

3. 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。

youdao

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。

youdao

5. 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。

youdao

6. 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。

youdao

7. 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。

youdao

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. 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》

10. 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》

11. Only if a teacher has given permission is a student allowed to leave the room.

学生只有得到老师的许可才能离开教室。

《牛津词典》

12. 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。

youdao

13. 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。

youdao

14. 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。

youdao

15. 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。

youdao

16. But I will promise to forgive you only if you find my ring.

我保证只要你找到我的戒指，我就会原谅你。

youdao

17. 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。

youdao

18. 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。

youdao

19. 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。

youdao

20. 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。

youdao

21. Only if you get married I'll be more lonesomer than ever.

只是，你结婚后，我会很孤独的。

youdao

22. Only if we master those abilities can we make a successful micro blog.

我们只有掌握了这些技能，才能做出一个成功的微博号。

youdao

23. Only if they operate at near capacity, otherwise, their overall efficiency is poor.

除非它们是在接近满负荷的情况下运行，否则整体效率会很低。

youdao

24. Only if you take an active part in physical activity will you be able to keep fit and stay healthy.

你只有积极参加体育锻炼，才能保持身体健康。

youdao

25. 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。

youdao

26. 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。

youdao

27. 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。

youdao

28. Failures stop us only if we let them.

除非我们任由失败拖累我们的脚步，否则失败无法阻止我们前进。

youdao

29. 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。

youdao

30. 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。

youdao

31. 15 我的眼目时常仰望耶和华，因为他必将我的脚从网里拉出来。

My eyes are ever on the Lord, for only he will release my feet from the snare.

-- 来源 --

32. Middle Earth@ in the Lord of Rings and offer Chinese translation.

Please pick out the words that can be only found in the

-- 来源 -- 空中美语-文学也精彩 - The Power of Good

33. FlexNet NT/NB Series Node (GPS Only)

FlexNet NT/NB 系列节点(GPS Only)

-- 来源 -- science - 汉英

34. IF-AND-ONLY-IF operation

“等价”运算

-- 来源 -- 英汉 - 翻译参考[网络]

35. How many pens do you have?

One word only for each blank.

-- 来源 -- 初中英语同步练 七上 与冀教教材同步(无声音) - Mid-term Test Mid-term Test A

36. Only if somebody cancels.

除非有人退票。

-- 来源 -- 英汉 - 翻译样例

37. recalled one of the clerks.

“Once he came in wearing only one shoe,”

-- 来源 -- B级考试专项突破----听力400练 - Chapter 3 (5)

38. 5 [和合]这样禁4食，岂是我所拣选使人刻5苦己心的日子吗?

NIV] Is this the kind of fast I have chosen, only a day for a man to humble himself?

-- 来源 --

39. fail to find relief in a doctor's office,

【练习3】Not only do patients with chronic health problems

-- 来源 -- PETS培训专用教材 第4级 - 第四章 阅读理解应试捷径 二 解题思路与高分突破 3. 翻译的技巧 （2）

40. IF-AND-ONLY-IF element

等同元素

-- 来源 -- 英汉 - 翻译参考[网络]