immemorial
adjective uk/ˌɪm.əˈmɔː.ri.əl/ us/ˌɪm.əˈmɔːr.i.əl/
from/since time immemorial literary 从很早开始，自古以来
for a very long time
Her family had farmed that land since time immemorial. 她的家族从很早开始便在那块土地上耕耘了。
These are questions that have intrigued philosophers from time immemorial.
It was the sort of speech head teachers have delivered to their students since time immemorial.
Global warming is changing the way polar bears have lived since time immemorial.
He scratched his initials into the wall, as prisoners have done from time immemorial.
Since time immemorial, humanity has questioned the possible existence of supernatural beings.
formal年代久远的，古老的
existing or traditional for an extremely long time
She said it was the immemorial custom of the villagers to have a feast after the harvesting. 她说村民们在收割之后举行宴会是一个古老的风俗。