Christopher Chen of the University of Pennsylvania grew flat sheets of mesenchymal stem cells and exposed them to a mixture of growth factors for bone and marrow development.
来自宾夕法尼亚大学的克里斯托弗·陈(音译)培育了间质干细胞薄片，并将其置于有助于骨骼和骨髓发育的混合生长因子中。
Large flat sheets of the icecap called ice shelves float in water near Antarctica.
大而扁平状的冰冠称作冰架，它们漂浮在南极洲周边的水域中。
Large flat sheets of the icecap called ice shelves float in water near Antarctica.
大而扁平状的冰冠称作冰架，它们漂浮在南极洲周边的水域中。
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