Scientists can predict how this instrument might have sounded by studying a copy of a smaller bird bone flute found several years ago in the same area.

VOA: special.2009.08.18

They sit deep within our brain and are enclosed by a dense bone.

这种细胞由骨密质包裹着,位于大脑的内部。

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By taking cells from the skin, for example, or cells from your blood or cells from the bone marrow and keeping them alive in culture, we've been able to study how human cells work and learn a lot about the functioning of human organism.

举例来说,通过从人的皮肤,骨髓,或者血液中提取细胞,并在培养基中培养,就能研究人类细胞是如何工作的,并在一定程度上了解人类机体的功能

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