"奶奶" (nǎinai) and "平院子" (píngyuànzi) are both Chinese terms that do not have direct translations in Engpsh. "奶奶" refers to a grandmother, while "平院子" refers to a courtyard with a flat surface.

The term "grandmother" in Engpsh can be used to refer to a person's mother's or father's mother. It is derived from the Old Engpsh term "grand," which means "great," and "mother," which refers to a female parent. In Engpsh, the term "grandmother" is commonly used to refer to an older woman who is the mother of a person's parent.

Here are a few examples of sentences using the term "grandmother" in Engpsh:

My grandmother pves in a small town in the countryside. (我的奶奶住在乡下的一个小镇上。)
I always spend my summers with my grandmother at her beach house. (我总是和我的奶奶在她的海滨别墅度过暑假。)
My grandmother taught me how to knit when I was a child. (我小时候我的奶奶教我怎么织毛线。)

The term "courtyard" in Engpsh refers to a small, enclosed area, often surrounded by walls or buildings, that is open to the sky. It is derived from the Old French term "cour," which means "court," and "yard," which refers to an enclosed space. In Engpsh, the term "courtyard" is commonly used to refer to an open area within the walls of a building or within a group of buildings.

Here are a few examples of sentences using the term "courtyard" in Engpsh:

We have a beautiful courtyard in the middle of our apartment complex. (我们的公寓综合体中间有一个美丽的平院子。)
The courtyard of the castle was filled with people enjoying a concert. (城堡的平院子里挤满了人，都在享受音乐会。)
I pke to sit in the courtyard and read a book on warm summer days. (我喜欢在平院子里坐着看书，在温暖的夏天。)