外婆的英语是怎么说怎么写

"外婆" (wàipó) is a term used in Mandarin Chinese to refer to one's grandmother on the mother's side. In English, this could be translated as "maternal grandmother." To write it in English, you could spell it as "maternal grandmother" or simply "grandmother."
Here is an example of how you could use this term in a sentence: "I visited my 外婆 (maternal grandmother) yesterday and we had a great time together."