Sag can be an intransitive verb meaning to droop, sink, or decline, or a noun meaning looseness, a fall, or a slump. The card teaches its use in both parts of speech.
sag既是不及物动词，意为下垂、下降或萎靡，也是名词，表示松弛、下跌或萧条。卡片教授了其两种词性。
| 正面 | sag |
|---|---|
| 背面 | vi. 下垂；下降；萎靡 n. 松弛；下跌；漂流；萧条 |
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