About
HSK levels

    高低

    gāodī

    1. height; level; (music) pitch
    2. relative superiority
    3. propriety; discretion (usu. in the negative, e.g. 不知高低[bu4 zhi1 gao1 di1])
    4. no matter what; just; simply (will not ..., must ... etc)
    5. at long last

    这两座山的高低差异很大。 Zhè liǎng zuò shān de gāodī chāyì hěn dà.