- 更多网络例句与使弓起相关的网络例句 [注：此内容来源于网络，仅供参考]
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However, some researchers have suggested that the invention of weapons such as spears and bows and arrows made intertribal warfare among early humans so lethal that group selection did take over.
然而，一些研究人员认为随着诸如矛，弓和箭这些武器的发明，使早起人类部落之间的战争甚为惨烈，因而群体选择发挥起了效应。
- 更多网络解释与使弓起相关的网络解释 [注：此内容来源于网络，仅供参考]
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masticatory muscles：咀嚼肌
2、咀嚼肌(masticatory muscles) 是运动颞下颌关节的肌,主要有颞肌和咬肌. 颞肌呈扇形,起自颞窝,向下会聚于下颌骨的冠突. 咬肌呈长方形,起自颧弓,止于下颌角外面. 二肌收缩均可上提下颌骨,使牙咬合.
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thyroarytenoid muscle：甲杓肌
(3)使声带紧张和松弛:有环甲肌(cricothyroid muscle)和甲杓肌 (thyroarytenoid muscle). 环甲肌起于环状软骨弓的前外侧,向上止于甲状软骨下缘. 该肌收缩时甲状软骨和环状软骨弓接近,以环甲关 节为支点,增加杓状软骨和甲状软骨之间的距离,