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....

“下颚骨”的英语可以翻译为：jawbone，submaxilary ...