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。

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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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The U.S. Navy, which uses Bubble Wrap to protect everything from jet parts to navigational equipment, likes the flat sheets because they occupy less space on its transport ships.

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The various categories of the flat rolled products include hot rolled sheets, cold rolled sheets, coated sheets, semi-finished bars and plates and tin mill products.

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Guests will find all the top amenities common to luxury hotels, including marble bathrooms, flat-screen televisions, Frette sheets, goose down comforters and pillow-top mattresses made especially for Four Seasons by Sealy.

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