Which three letters can frighten a thief away?
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解析：
Think of words ending in "gry." Angry and hungry are two of them. There are only three words in the English language. What is the third word? The word is something that everyone uses every day. If you have looked carefully, I have already told you what it is.以“gry”结尾的词，比如Angry and hungry 生气和饥饿是其中的两个。那么问题来了，“在英语”里有三个词，第三个词是什么？这是我们每天都要用的一样东西，如果你仔细看的话，我已经告诉你了。
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