Mark Twain is quoted to show that the disapproval of smiles in pictures was a deep-rooted belief.
文章引用马克·吐温的话表明，表明在照相时不愿微笑是源于一种根深蒂固的信念。
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Even Mark Twain, a man who enjoyed a hearty laugh, said that when it came to photographic portraits there could be "nothing more damning than a silly, foolish smile fixed forever".