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the Great Wall, which snakes through half of our country. They built walls to ward off enemies and evil spirits. This tradition has been maintained to this day as we still have many parks and schools walled off from the public. I grew up at the foot of the city walls, and I39。ll put to use what we have learnt abroad.The third door is the door to lifelong learning. As new ideas appear all the time, we always need to acquire new knowledge, regardless of our age. Naturally, my aunt herself is the best example. Many of my aunt39。s degree in biochemistry. We are now taking the opportunity to study overseas, and when we e back, we39。m studying in a city famous for its walls. All visitors to my city are amazed by the imposing sight of the city walls, silhouetted by the setting sun with gold and shining lines. With old, cracked bricks patched with lichen, the walls are weatherbeaten guards, standing still for centuries in protecting the city.Our ancestors liked to build walls. They built w