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。
This bottle of vinegar is very sour. I cannot bear its sourness.
这瓶醋很酸。我不能忍受它的酸性。
Such protestations were lost to the sourness of the national mood.
这种辩解在国民的不满情绪面前全然无用。
He gave his twisted smile, though this time with a touch of sourness.
他又露出那种歪嘴的笑容，不过这次带上了一丝酸楚。
He gave his twisted smile, though this time with a touch of sourness.
他又露出那种歪嘴的笑容，不过这次带上了一丝酸楚。
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