Beak color gives away a kingfisher's gender: males show mostly black, while females have an orange lower mandible that matches their feet.
喙的颜色可以用来区分翠鸟的性别：雄性的喙大部分是黑色，而雌性的下颌是橙色的，正好同它的脚相配。
Objective:To observe the blood supplies system of the lower jaw bone and provide anatomical basis for clinical surgery of mandible.
目的：研究下颌骨的血供，为有关下颌骨的外科临床提供解剖学基础。
The lower mandible could not move backward.
下颌不能再向后运动。
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