1. Yes, too long and intense an acquaintance can lead to sourness. 的确，如此过久而认真的相知可导致坏心眼。
2. A rice wine would reduce sourness if vinegar is added too much in cooking. 做菜时，如果醋放多了，加一点米酒就会调轻酸味。
3. A lactic acid bacterium drink with rich nutrients and pleasant sweetness and sourness was made from black wheat and milk. 以黑小麦、牛乳为原料，用驯化的乳酸菌进行发酵制成营养丰富、酸甜适度黑小麦乳酸菌饮料。
英英解释
n.
1. the taste experience when vinegar or lemon juice is taken into the mouth
2. the property of being acidic
3. a sullen moody resentful disposition
