protractor muscle造句

_Protractor muscles, that extend along the salamander's sides, squeeze down hard on the tapered tips of the tongue skeleton.
The strong protractor muscles allow them to part a mat of grass and their eyes are positioned to obtain a binocular view of the space between the parted beak.
This adaptation is most strongly developed in the common starling ( along with the protractor muscles responsible for opening the jaw are enlarged and the skull is narrow, allowing the eye to be moved forward to peer down the length of the bill.
It's difficult to find protractor muscle in a sentence. 用protractor muscle造句挺难的