奶奶 (nǎi nai) means “(informal) grandma (paternal grandmother); (respectful) mistress of the house; (coll.) boobies; breasts”. It is an HSK 3 Chinese word in the HSK 3.0 vocabulary.
Measure word: 位
我奶奶今年八十岁了。
Wǒ nǎinai jīnnián bāshí suì le.
My grandma is eighty years old this year.
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