About
HSK levels

    下行

    xiàxíng

    1. (of trains) down (i.e. away from the capital); (of river boats) to travel downstream
    2. to issue (a document) to lower bureaucratic levels
    3. (of writing on the page) vertical, proceeding from top to bottom

    下行火车在下午三点出发。 Xiàxíng huǒchē zài xiàwǔ sān diǎn chūfā.