About
HSK levels

    1. one; single; a (article)
    2. as soon as
    3. entire; whole; all; throughout
    4. "one" radical in Chinese characters (Kangxi radical 1)
    5. also pr. [yao1] for greater clarity when spelling out numbers digit by digit

    我有一个苹果。 Wǒ yǒu yī ge píngguǒ.