它的嘴巴用英文怎么说

"嘴巴" 的英文说法是 "mouth".

来源: 词源学上, "mouth" 源自古英语 "mūð"，是古北欧语根"munthaz"的派生词。

例句:

He stuffed a piece of gum into his mouth. (他把一块口香糖塞进了嘴里。)
She closed her mouth and crossed her arms. (她闭上嘴巴，双臂交叉。)
The fish swam towards the open mouth of the cave. (鱼向着洞穴的入口游去。)