Assertion: middle ear's bone | /r/CapableOf | form hard part of the forehead
Facets:
Source sentences:
text: , the largest of the paranasal sinuses, are under the eyes, in the maxillary (cheek) bones the frontal sinuses , superior to the eyes, in the frontal bone, which forms the hard part of the forehead
text: , superior to the eyes, in the frontal bone, which forms the hard part of the forehead the ethmoid sinuses , which are formed from several discrete air cells within the ethmoid bone between the nose and the eyes