Experience tell us that individuals and private corporations tend to act in their own short-term economic and political interest,
最后一个词interest,在这句话里应该是利益的意思吧,怎么不加s,当利益讲不是可数吗?难不成是兴趣的意思,我觉得不太合理啊
这是一种省略现象。economic and political interest = economic (interest) and political interest.
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根据《牛津高阶英汉双解词典》第9版,interest 表示“好处,利益”的意思时,通常用复数形式,但是也可以作不可数名词。