検索内容:
seventeen; 17
My younger sister is seventeen years old.
decahedron
He is studying the shape of a decahedron.
sixteen; 16
My birthday is on the sixteenth.
twenty; 20
It takes twenty minutes to get to my house.
(obsolete) twenty; 20
He had twenty old coins.
decimal system
We usually represent numbers using the decimal system.
a decagon
He drew a decagon shape.
scores, dozens
He read scores of books.
forty; 40
My father is forty years old.
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