About
HSK levels

    1. to rein in; to compel; to force
    2. (literary) bridle; halter; headstall
    3. (literary) to carve; to engrave
    4. (literary) to command; to lead (an army etc)
    5. (physics) lux (abbr. for 勒克斯[le4 ke4 si1])

    骑士勒住了马的缰绳。 qī shì lè zhù le mǎ de jiāng shéng.

    lēi

    1. to strap tightly; to bind

    他用绳子勒紧了箱子。 Tā yòng shéngzi lēijǐn le xiāngzi.