These posts can make us feel a strong emotion – such as seeing somebody moved by the ending of a story – that we want to share with other people. If something is familiar to us, such as being a fan of romance or sci-fi novels - we are likely to share posts on these subjects as well. The more shareable a post is, the more likely it is to trend – or even go viral.
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Some command line parsers, like GNU's getopt_long for C and pflag for，推荐阅读91视频获取更多信息