About
HSK levels

    五通

    wǔtōng

    1. bottom bracket shell (in a bicycle frame)
    2. (Buddhism) the five supernatural powers (abbr. for 五神通[wu3 shen2 tong1])

    自行车的五通需要定期维护。 zìxíngchē de wǔtōng xūyào dìngqī wéihù.