There is an old Chinese saying that the moon in the hometown is full. Everytime when I go back to my hometown, I will think of this saying. Indeed, the moon in my hometown is much clear and bigger. The most important factor is that the sky is not polluted seriously, so I can see the blue sky. Unlike in the cities, the buildings are tall and people’s visions are covered. What’s more, there are so many factories setting out the gas that pollutes the air. When I stay in the city, I will miss my hometown, not noly the beautiful scenery, but also the clean moon.