"之前"是一个中文词，在英语中可以表示为 "before" 或 "previously"。
"Before" 是一个副词，
意思是 "在另一事件或时间之前"。例如：
I finished my homework before dinner. (我在晚饭前完成了作业。)
He called me before he left for work. (他在去上班之前给我打电话。)
"Previously" 也是一个副词，
意思是 "在过去" 或 "以前"。例如：
Previously, I had only visited New York City once. (以前，我只去过纽约市一次。)
The company was previously known as XYZ Inc. (这家公司以前叫做 XYZ Inc.)
希望这些信息对您有帮助。
