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定义全局变量应使用函数
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Nowadays 1 people are becoming interested in travelling on holiday. There are many 2 of travelling. 3 you can visit many exciting places and enjoy the special food there. 4 , you can make friends by travelling so that your social circle is5 . 6 , you get chance to experience different cultures that can7your understanding of the world. What's more , no matter how 8you are, there is always a lot for you to learn through travelling. The main reason why many people like travelling is that it can help 9 stress and 10 . For example, most people are likely to have a short trip on the weekend after days of hard work.
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