Monkey heard that Boss Niu asked for a tutor, so he went to apply. He found Boss Niu in the paddy field, and the two sides agreed on related matters. The next day, the monkey was going to teach. Before leaving, he arched into the water. The pond was covered with muddy mud water. The mother monkey felt strange when she saw it and asked why he was so. The monkey said: "I saw the boss of the cow just like this yesterday, and probably their family just started it. Boss Niu saw the dirty appearance of the monkey, and was displeased, and yelled at him to leave. The monkey asked in amazement: "Did you not do that yesterday?" Boss Niu closed the door and replied scornfully: "My Working in a paddy field! ". The enlightenment of this allegorical story to grassroots civil servants is:. ['Hard work is most welcomed by the masses.', 'In-depth investigations can better serve the masses.', 'The closer relationship does not solve the problem better.', "Understanding people's demands can solve people's suffering."]