c. 1600, from French immémorial (16c.) "old beyond memory," from Medieval Latin immemorialis, from assimilated form of in- "not, opposite of" (see in- (1)) + memorialis (see memorial). Something immemorial is ancient beyond memory; something immemorable is not memorable.
实用例句
1. The Barton family have lived in this village since time immemorial.
巴顿家族自古以来就住在这个村里.
来自《简明英汉词典》
2. 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。
来自柯林斯例句
3. It has remained virtually unchanged since time immemorial.
实际上，自古以来它几乎没有任何改变。
来自辞典例句
4. Communicable diseases have been a curse of mankind since time immemorial.
自古以来,某些传染性疾病就是人类的灾祸.
来自辞典例句
5. There have been ponies on Dartmoor from time immemorial.