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？
Why do certain species go extinct?
为何存在某一种类灭绝？
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。
How do certain diseases affect signal transduction?
某些疾病如何影响了信号转导？
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。
是否会出现某些字符？
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？
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。
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。
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