The flashcard teaches that 'trace' as a noun means a mark or sign left behind, and as a verb, it means to follow the course or development of someone or something.
卡片教授：trace（痕迹）是一个名词，表示留下的印记或迹象；（追踪）是一个动词，表示跟随某人或某物的踪迹。
| Front | trace |
|---|---|
| Back | n.痕迹 vt.追踪 |
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