The study found this loss of bone strength increases the risk of broken bones later in life.

VOA: special.2009.03.10

Through many decades of study, biologists have teased out certain populations of cells within the bone marrow that are capable of reproducing subsets of cells.

经过数十年的研究,生物学家们在骨髓中发现了,一些细胞群,它们能够生成细胞亚群

耶鲁公开课 - 生物医学工程探索课程节选

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

耶鲁公开课 - 生物医学工程探索课程节选

Ten patients in all were treated in a study with donated bone marrow.

VOA: special.2009.12.16

His latest study is this skull bone of ceratosaurus , a large predatory dinosaur.

VOA: standard.2009.12.08