About
HSK levels

    lǎo

    1. old (of people); venerable (person); experienced; of long standing
    2. always; all the time
    3. very
    4. of the past; outdated
    5. (of meat etc) tough
    6. prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity

    我的老师已经教了三十年书。 Wǒ de lǎoshī yǐjīng jiāo le sānshí nián shū.