About
HSK levels

    老化

    lǎohuà

    1. (of a person, population or material) to age
    2. (of knowledge) to become outdated

    我们的设备已经老化了,需要更新。 Wǒmen de shèbèi yǐjīng lǎohuà le, xūyào gēngxīn.