人体最硬的骨头是下颚骨(颔骨)?The hardest bone in the human body is the jawbone.龟龟的耳鼓膜通常在下颚骨的后边.The ear scales , the tympanic membranes , are the two large'scales'just behind the jaw - bone....
而且他的面孔光润, 颚骨下陷.And then his face was smooth , with a receding jaw.强壮齿龈和颚骨, 减少疾病传染.Strong gum and jaw bone, to reduce the spread of the disease.她们嘴唇纤薄,眼睑象纸似的扑闪, 颚骨见棱见角, 喉结突出,心灵枯萎.They have thin lips and papery eyelids, bo...