6.【农】+ land贫瘠的；酸性过重的
7.【化】+ oil, gas, petrol含硫量高的；高硫的
8.to go sour or to turn sour
relationship, plans, situation +出问题；变坏；变糟
Everything turned sour for me there.在那里, 一切对我来说都乱了套。
Even the European dream is beginning to turn sour.连那个欧洲梦也开始破灭了。
His marriage went sour.他的婚姻出了问题。
milk +变酸；变坏；馊掉
The milk had gone sour.牛奶馊了。
weather, climate +变坏；变得恶劣
When the weather turns sour, don't despair!天气变糟时, 不要绝望！