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以前, 之前
used to refer to a time in the past, showing how much time has passed before the present moment
- She moved to this city three years ago.
她三年前搬到了这个城市。
- They met a long time ago in college.
他们很久 以前 在大学里见过面。
- I finished reading that book a month ago.
我一个月前读完了那本书。
- The company was founded over a century ago.
该公司成立于一个多世纪前。
- He left the office just a few minutes ago.
他刚刚几分钟前离开了办公室。