不规则动词
中文翻译：酸的
同义词：
['sour', 'soured', 'sourness']
例句：
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1. The milk has gone sour after a few days.
几天后，牛奶变酸了。
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2. She ate the sour pickle and felt it was very good.
她吃了这个酸菜，觉得非常好。
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3. The wine has gone sour after being stored for too long.
酒存放时间过长后已经变酸了。