immemorial

1. 自远古以来
If you say that something has been happening since time immemorial or from time immemorial, you are emphasizing that it has been happening for many centuries.

e.g. It has remained virtually unchanged since time immemorial...
实际上,自古以来它几乎没有任何改变。
e.g. From time immemorial there has been the belief that there are good and bad places to be.
人生既有顺境，也有逆境，这种观念自古有之。

2. 无法追忆的;远古的;古老的
You use immemorial to indicate that something has existed for many centuries.

e.g. ...a modern version of an immemorial myth.
远古神话的现代版本

1. 古老的, 远古的, 无法追忆的：memorial 纪念物, 纪念馆, 纪念议事, 请愿书 | immemorial 古老的, 远古的, 无法追忆的 | leer 送秋波, 斜视

2. 古老的,无法记忆的：impossible 不可能的 | immemorial 古老的,無法記憶的 | imperfect 不完美的

3. 古老的：immelodious 不动听的 | immemorial 古老的 | immense 极广大的

4. 太古的：immediately 即刻地 | immemorial 太古的 | immense 无限的