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1·The heat had caused milk to go sour.

高温使牛奶变质了。

2·Food can easily go sour in warm weather.

天热时食物很容易变馊。

3·If milk is not a cool place, it will go sour.

牛奶如果不存放在阴凉处，很快就会坏了。

4·If milk is not kept in a cool place, it will go sour.

牛奶如不存放在阴凉处，很快就会变坏的。

5·Milk must be kept in a cool place, or else it will go sour.

牛奶如果不存放在阴凉处，很快就会坏了。

6·Milk must be kept in a cool place, or else it will go sour.

牛奶要放在阴凉地方，否则会发酸。

7·Milk must be kept in a cool place, or else it will go sour easily.

牛奶要放在阴凉的地方，否则就容易变酸。

8·If you keep the milk in the refrigerator, it won't go sour so quickly.

如果把牛奶保存在冰箱里，它不会那么快就变酸。

9·In some ways, it is a strange time for multinationals to go sour on China.

从某些方面来说，此时美国跨国公司对中国感到失望让人觉得奇怪。

10·Or a social interaction might go sour, with one marmot nipping or chasing another.

但同时，社交互动也可能会变得很不愉快，就像一只土拨鼠会厮咬或追逐其他同类。 “土拨鼠们对待彼此总是很粗暴。”