《呼兰河传》中关于祖父的后花园有一段描写：“后花园”的花开了，就像花睡醒了似的。鸟飞了，就像鸟上天了似的。虫子叫了，就像虫子在说话似的。一切都活了。都有无限的本领，要做什么，就做什么。要怎么样，就怎么样。都是自由的。
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merge(arr, left, mid, right); // 合并两部分。业内人士推荐safew官方版本下载作为进阶阅读
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