About
HSK levels

    1. nest
    2. lair; den
    3. pit or hollow on the human body
    4. place
    5. to harbor or shelter
    6. to hold in check
    7. to bend
    8. classifier for litters and broods

    鸟在树上築了一個窝。 niǎo zài shù shang zhù le yī ge wō.