The sternum is a long, flatbone and is vital in the production of red blood cells.
这句话的意思是指这根长且扁的胸骨可以制造 红血球吗？
2
Look at the skull of specimens, our skull shape and size from the 23 different flatbone and the bone structure not owned.
请看这个颅骨的标本，我们的颅骨由23块形状大小不同的扁骨和不归则骨构成。
3
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.