西班牙湖水污染严重，都怪中国人爱吃猪肉？这？

笔记：cool down 凉快，降温
cool 这个单词本身就有凉快，凉爽的意思。 cool down是一个动词词组表示变凉，降温， to become cooler in temperature. 这个词组不仅仅可以形容气温，它还可以用来形容人，表示使冷静下来，相当于calm down, to become calm after being angry. 
Don't expect temperatures to cool down by then. 
别指望那个时候天气能凉快下来。
The air has cooled down a little now.
空气凉快了一点。 
After I cooled down I realized I had been wrong.
我冷静下来之后才意识到自己错了。




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