So how common is this problem?

此类问题究竟有多普遍呢？

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But scientists do not know exactly how common microchimerism is.

但是科学家们并不是确切知道微嵌合体到底有多普遍。

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Dr Abel, meanwhile, is trying to gauge how common these genetic effects are.

与此同时，Abel博士，正试图了解这些遗传效应到底有多普遍。

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How common are needle sticks among health care workers?

VOA: special.2010.02.10

That's something that we see again and again and it's remarkable how little common sense is often applied.

这些技能是我们司空见惯的,当时很奇怪人们一般却没有注意到它们。

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How can we care for things, ? how can we truly care for things that are common?

我们如何关心事物，我们如何真正关心共同的事物？

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That plethora allows astronomers to start drawing conclusions about how common various sorts of planets are.

ECONOMIST: Another Earth?

How common is it in the general population, beyond the population of studied athletes?

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There is uncertainty about how common such infections are, since no clearinghouse compiles statistics on their incidence.

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