Why do certain liquids tend to foam while others do not?
为什么某些液体容易起泡，而有些则不行呢？
是否会出现某些字符？
Why do certain species go extinct?
为何存在某一种类灭绝？
Do certain circumstances bring out this trait?
是特定的环境造成的这种特质吗？
Do certain words resonate better than others do?
某些词语是否比其他要好？
How do certain diseases affect signal transduction?
某些疾病如何影响了信号转导？
We always have some doubt when we do certain things.
我们总是有一些疑问，当我们做一些事情。
Do certain activities less often and some new ones, more often.
对于某些活动要少做些，同时要多做些新的事情。
Besides, they only do certain tasks, eschewing all other work.
此外，他们只做固定的工作，避开其他的任务。
Yes. I'm allergic to penicillin. And should I do certain exercise?
是的，我对青霉素过敏，我需要做某种锻炼吗？
You keep telling me that you will do certain things, but you never do them.
你一直告诉我你会做某些事情，但是你却都没有做到。
The opportunity to do certain things in life can present itself in unexpected ways.
生活中的某些机会是以你意想不到的方式出现的。
But sometimes certain species of birds do the exact opposite.
但有时，某些种类的鸟类却会做出相反的举动。
I still do a certain amount of work for them.
我仍旧为他们做一定数量的工作。
I'm fairly certain I can do the job.
我有相当把握能干这项工作。
There are certain situations that do warrant extra protein.
在某些情况下确实会需要额外的蛋白质。
However, certain other species on which the larvae feed do not harbor the bacterium.
然而，幼虫所食的某些其他物种却不存在这种细菌。
A block of space usually is for a day, and there is enough space for you to write down what you need to do on that certain day.
一个大块的空页面通常就写一天的内容，有足够的空间让你写下那天你需要做什么。
Decide ahead of time what you're going to do at certain times each day.
提前决定你在每天的各个特定时间段要做什么。
Basically, it uses math to predict what an individual would do under certain circumstances.
基本上，它利用数学来预测一个人在特定情况下会做什么。
Big business enjoys certain priviledges that small ones do not.
大商行享有小商店所没有的优惠权。
Do you lack a certain skill and need some training?
你是缺少某项技能吗还是需要一些培训？
Are there certain things that you do and don't eat and why?
您有某些确定吃或者不吃的食物吗？为什么？
“We do know certain facts, ” I offered.
“一些既定事实是很清楚的。”我说。
On other projects, you might do only certain components.
而在其它类型的项目中，你可能只会涉及到其中某些阶段。
Or do you only tell certain people?
或者你是不是只是告诉了某些人？
But under certain circumstances, we still do it.
但是在某种情况下，我们仍然会这样吃。
But under certain circumstances, we still do it.
但是在某种情况下，我们仍然会这样吃。
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