This flashcard teaches the two parts of speech for "filter": as a verb it means "to filter", and as a noun it means "filter paper".
此卡片教授“filter”一词的两种词性：作为动词时意为“过滤”，作为名词时意为“滤纸”。
| Front | filter |
|---|---|
| Back | v.过滤 n.滤纸 |
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