docs: public void load(String modelFile) throws IOException, ClassNotFoundException {
  		System.out.println("加载N-Gram模型:" + modelFile);
  		System.out.println("load ...");
  		System.out.println(modelFile);
  		ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(
  				new GZIPInputStream(new FileInputStream(modelFile))));
  		n = (Integer) in.readObject(); 
  		System.out.println("ngram " + n);
  		in.close();
  		System.out.println("load end");
  	}