例句與造句

1. The sphenoidal conchae are each developed from a center that makes its appearance about the fifth month; at birth they consist of small triangular laminae, and it is not until the third year that they become hollowed out and coneshaped; about the fourth year they fuse with the labyrinths of the ethmoid bone, and between the ninth and twelfth years they unite with the sphenoid bone.
2. It's difficult to find labyrinth of the ethmoid bone in a sentence. 用labyrinth of the ethmoid bone造句挺難的