本文作者： 21ST

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今天的微笑特别多，问候也格外温暖。因为整个世界都在这一天说：“你好！”Today is a special day. It's full of smiles and greetings. It's World Hello Day! 你也是第一次过“世界问候日”吗？其实它已经34岁了。It started on November 21, 1973. On this day every year, people greet others. It's also a day for peace...