Contraction of the zygomatic major muscle elevates and retracts the corner of the mouth, while the depressor labii inferioris pulls the lips down and out.是什么意思_Contraction of the zygomatic major muscle elevates and retracts the corner of the mouth, while the depressor labii inferioris pulls the lips down and out.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句