一 (yī) means “one; single; a (article); as soon as; entire; whole; all; throughout; "one" radical in Chinese characters (Kangxi radical 1); also pr. [yāo] for greater clarity when spelling out numbers digit by digit”. It is an HSK 1 Chinese character in the HSK 3.0 vocabulary.
我有一个苹果。
Wǒ yǒu yī gè píngguǒ.
I have one apple.
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