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Why does the emoticon pack have a downward arrow?

The expression pack has a downward arrow because the network is not good. Because there is an arrow, it means that this short message is sent because the network is not good, and it will be gone if it is sent. Expression pack is a Chinese vocabulary, which refers to a way to express feelings with pictures. Emoji pack is a popular culture formed after social software is active. Emoji packages are very popular on the internet, and almost everyone will send them.