what is the real concept of beauty?

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yesterday i got a call,one of my classmate said to me that she finally considered herself beautiful now because she did nose job recently.i have been remembering that about two years ago she made the double-eyelid operation,so aching but she thought painsworthy. she is so excitied in call but i sink into thinking.what is the real concept of beauty?it is only the image?the operation really can make us more beautiful?