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。
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。
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。
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。
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。
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。
I'll do that, but only if we set a few rules.
我可以干，但我们得定几条规矩。
Missing join predicates, but only if a foreign key is defined.
丢失连接谓词，只在定义了外键的情况下。
The trend is real. I'll invest, but only if the price is right.
看来这波行情是真的，等到价格合适的时候我在入场。
It can yield untold benefits, but only if people use it wisely.
科学进步可以产生无限的好处，但只有在人们能够明智地利用科学进步的时候才行。
These pay a fixed rate of interest but only if the bank is profitable.
这些金融工具只有在银行盈利的情况下方可支付定额利息。
Note: Your anger can be useful, but only if you express it in a helpful way.
注意：只有当你以积极的方式表达愤怒时，你的愤怒才可能产生正面的作用。
Ignorance can be tolerated, but only if you plan to investigate the unknown.
仅当您打算研究未知事项时，才能容忍无知。
Dressing for work can be a battle, but only if you don't know what you're doing.
为工作着装就跟打仗似的，除非你不知道你在干嘛。
Marty finally agreed, but only if Fred would go there with him to give him courage.
马蒂最终同意了，但是要求佛瑞德和他一起去，给他鼓气。
For example, a rule might select links, but only if they are within a paragraph tag.
例如，一个规则可以只选择段落标记内的链接。
More gaming may actually be better but only if parents play along, a new study finds.
但新的研究表明，只要在家长陪同的情况下，多一点游戏时间，事实上可能更好。
But only if Paley finds the financial backing which he failed to obtain 10 years ago.
但条件是帕雷能找到10年前他没能得到的经济支持。
That is our hope - but only if we pray together, and work together, and march together.
只要我们一起祈祷，一起努力，一起前进，希望就伴随我们。
Sharing your bed can reduce your brain power - but only if you are a man, say scientists.
科学家提示：如果你是男性，和伴侣同床共枕会使你的脑力下降。
James reiterated that forking can be a good thing, but only if the results are merged back.
詹姆斯重申了自立门户可以变成一件好事，只要开发成果能够回归。
Germany is likely to carry the day, but only if it can find a way to force through a new treaty.
德国有可能获胜，但是只有当其强行通过一项新的条约后才有可能。
So that to the ancient Romans at least hyenas were looked up to, but only if they were dead.
因此，古罗马人认为鬣狗值得尊敬，不过只有在它们死掉以后。
This would normally invalidate their posts but only if it is spotted by the quality control team.
只有被质量控制小组发现，否则这些帖子是可以计入有效发布的。
The XP practices can help change people's minds, but only if those people start using the practices.
XP实践可以帮助人们改变思维，但是只有当他们开始使用这些实践时才会有帮助。
Your body can burn flab while you sleep, but only if it isn't too busy processing a full stomach.
在睡眠过程你的身体也会燃烧脂肪，除非它被忙于处理一个填饱的胃。
You can play right from the first day of your life until your last breath but only if you want to!
只要你愿意，你可以从你人生的第一天一直玩到你呼吸的最后一刻！
You can play right from the first day of your life until your last breath but only if you want to!
只要你愿意，你可以从你人生的第一天一直玩到你呼吸的最后一刻！
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