About
HSK levels

    1. surname Pi

    1. skin; peel; rind; outer layer; leather; hide; fur; cover; wrapping; outer covering
    2. (of food) no longer crisp; soggy
    3. (coll.) naughty; mischievous
    4. pico- (10⁻¹²)

    这个苹果的皮很厚。 Zhège píngguǒ de pí hěn hòu.