Definition
up to the present time; until now
直到目前；直到今天
To this day, we still don't know what happened back then.
直到今天，我们仍然不知道当时发生了什么。
Her memory of the accident remains vivid to this day.
她对那次事故的记忆至今仍然鲜明。
The mystery remains unsolved to this day.
这个谜团至今仍未解开。