处理多个字典文件时，避免file对象生命周期延长的问题 #23
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按照之前的写法，dictFile对象的Close的操作一直会到LoadDictionary函数执行结束的时候才会执行，但是离开了for循环dictFile这个对象就没有存在的必要了，这样defer延长了dictFile的生命周期，另外如果需要载入多个字典文件的话，会有额外的内存开销，所以现在使用匿名函数处理字典文件，保证每处理完一个字典文件，都会立刻释放资源