嘴巴（mouth）是英文单词，可以写作 "mouth"。它是指人或动物的口腔，是吞咽、咀嚼食物和发声的器官。例如：

She opened her mouth to speak. 她张开嘴巴说话。
He smiled, showing his white teeth and a hint of dimples at the corners of his mouth. 他笑了，露出他洁白的牙齿，嘴角有一丝酒窝。