这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
我不清楚菜谱上有什么，但一定很精彩。
I don't know what's on the menu, but I'm sure it will be good.
他几周都不换衣服，但一定确保擦亮他的武器。
He wears the same things for weeks, but makes sure his weapons are clean.
为人一生一件蠢事也不做，但一定听说了上百遍蠢事。
One cannot do a foolish thing once in one's life, but one must hear of it a hundred times.
对于一个商务约会，提早五分钟到是很合适的，但一定不要迟到。
For a business appointment, it is considered proper to be five minutes early, but never late.
我们虽然未必要事事争第一，但一定不能让“不争”成为行动纲领。
We need not strive for the first at every return, but never let "no striving" become our action creed.
当你很累的时候，你可以对自己说，我很累，但一定不要说，我做不到。
When you're tired, you can say to myself, I am very tired, but must not say, I can't do.
在能量网的不同点，能量生命或休息或工作，彼此不同但一定程度上有相似之处。
At various points in the web, creatures of power rest or work, each different from the others, but all somehow the same.
避免强光—如果半夜醒来后30分钟内不能再次入睡的话，干脆起床，但一定尽量避免强光。
Avoid BRIGHT LIGHTS - if you wake up in the middle of the night and can't get back to sleep within 30 minutes, get up but avoid as much light as possible.
但一定多于15，因为他是一名很棒的球员，我们可以创造很多机会，他可以依靠我们球员的能力进球。
But more than 15 because he's a very good player and we can create a lot of chances. He can score goals with the quality of our players.
无论你在家把地板打扫得多一尘不染，但一定还是会有一些小颗粒会进到你电脑的齿轮中，让事情变得更糟。
No matter how spic and span you keep your floors at home, there are still bound to be tiny particles down there that can get into your laptop's gears and mess things up.
首先其“不锈”只是相对于而言没那么容易而已，但一定条件下仍然会发生变化的，主要看钢中其他元素含量。
First of all, it is not so easy to rust, but under certain conditions will still change, mainly to see the content of other elements in steel.
我自己也说不清楚，但一定是件令人愉快的事儿，也许不是那一天那一月，但一定就在未来不确定的某个时期。
I cannot precisely define what they expected, but it was something pleasant: not perhaps that day or that month, but at an indefinite future period.
早起，因为有事要做，但一定还要给自己来点激励性奖赏，要么给自己留点时间欣赏电视节目，要么轻松地走一走。
Get up because you need to get stuff done, but make sure you also give yourself a little motivational rewards, whether it be allotted time for a TV show, or a nice brisk walk.
国家女性和家庭研究中心主任DianaZuckerman说，FC2不太可能是个巨大的售货者，但一定赢得更多的使用者。
Diana Zuckerman, head of the National Research Center for Women & Families, said the FC2 is unlikely to be a big seller in the United States but could win over more users elsewhere.
可以在 config-store/index.properties 中找到可用配置，但一定不要更改该文件，因为这样可能破坏您的安装。
You can find available configurations in config-store/index.properties, but be careful not to change this file, because that might corrupt your installation.
你会受到一定程度的批评，但这是你必须面对的。
You are going to have to take a certain amount of criticism, but you must cope with it.
虽然这些化学物质的简单存在并不一定表明存在健康风险，但典型的美国人身上携带这些化学物质的事实让琼和他的同事感到震惊。
While the simple presence of these chemicals does not necessarily indicate a health risk, the fact that typical Americans carry these chemicals at all shocked June and his fellow participants.
虽然这些化学物质的简单存在并不一定表明存在健康风险，但典型的美国人身上携带这些化学物质的事实让琼和他的同事感到震惊。
And while the simple presence of these chemicals does not necessarily indicate a health risk, the fact that typical Americans carry these chemicals at all shocked June and his fellow participants.
一定程度的气候变暖是确定无疑的，但其程度将由冰的融化、海洋、水蒸气、云和植物的变化等循环过程所决定。
Some warming is certain, but the degree will be determined by cycles involving melting ice, the oceans, water vapour, clouds and changes to vegetation and plants.
所有这些解释都有一定道理，但还不够充分。
There's some truth to all these explanations, but they aren't quite sufficient.
随着年龄的增长，人类的大脑具有了一定的数量本能，但这种本能是非常有限的。
Human brains come equipped with certain quantitative instincts that are refined with age, but these instincts are very limited.
但这并不一定代表幸福婚姻的增加，这一趋势也不太可能持续。
But this won't necessarily represent an increase in happy marriages, nor is the trend likely to last.
例如，做过股票交易所价格实验的曼德尔布洛特指出，尽管结果是可变的，但实际上存在一定的一致性。
Mandelbrot, who did the experiment with stock exchanges prices, for example, noted that although the outcomes were variable, there were, in fact, certain constancy.
它尽管在陈述观点的方面表现出明显缺陷，但总体是可理解且连贯的，并且表达上具有一定的流畅性。
It is generally intelligible and coherent, with some fluidity of expression, though it exhibits some noticeable lapses in the expression of ideas.
它也许可以煎一个更大的蛋卷，但大鸡蛋不一定更好，当然也不会让下蛋的母鸡高兴。
It might make a larger omelette but a bigger egg isn't necessarily a better one and it certainly doesn't make the hen that laid it very happy.
它也许可以煎一个更大的蛋卷，但大鸡蛋不一定更好，当然也不会让下蛋的母鸡高兴。
It might make a larger omelette but a bigger egg isn't necessarily a better one and it certainly doesn't make the hen that laid it very happy.
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