code: public static void remove(String key, String word) {
  
          SmartForest<List<String>> synonyms = get(key);
  
          SmartForest<List<String>> branch = synonyms.getBranch(word);
  
          if (branch == null || branch.getStatus() < 2) {
              return;
          }
  
          List<String> params = branch.getParam();
  
          synonyms.remove(word);
          branch.setParam(null);
          params.remove(word);
  
          if (params.size() == 1) { //如果是1 个也删除
              synonyms.remove(params.get(0));
              params.remove(0);
          } else {
              params.remove(word);
          }
      }
docs: 从同义词组中删除掉一个词 [中国, 中华, 我国] -> remove(我国) -> [中国, 中华]
  
  @param words