gèn gǔ
throughout time
from ancient times (up to the present)
gèn gǔ wèi yǒu
unprecedented
never seen since ancient times
gèn gǔ tōng jīn
from ancient times up to now
throughout history
gèn gǔ bù biàn
unchanging since times immemorial (idiom)
unalterable
unvarying
monotonous