题目内容：

请问"this time it's different"的内涵
Just now i read an article in The Economist ,in which the first sentence goes like this :"THIS time it's different" are the four most expensive words in English language,runs a saying among banker .
Question :I wanna know why the author said so?plesae give me a detailed explaination why "This time ti's different "are the most expensive words (You may answer in English if you'd like.)
Thanks a lot
随便用中文还是英文来回答，只要回答得正确即可。我一定会追加分数的！
补：谢谢第一位朋友!I believe it's unnecessay for you to read the whole article before answering my question,since there is little relation between the whole article and the meaning of the first sentence .

优质解答

The four most expensive words in the English language are 'this time it's different.' -- Sir John Templeton.People,who don't learn from previous lessons and think that what happens now is different,ar...