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瞳孔开大肌 tóng kǒng kāi dà jī
anat. dilator pupillae (位于瞳孔周围,呈放射状排列的平滑肌,受交感神经支配,收缩时使瞳孔开大,增加射入眼球内的光线量)
otorhinol. dilator muscle of pupil; dilator pupillae; dilator pupillae muscle