Today it seems i see suddenly we needn't be perfect, but we should have a goal and possess positive attitude to life.We know we make progress every day. we should cherish what we possess. we should live a comfortable and neat life. Then we can calmly listen to the flow of time river, run, run, run, everyone is the passing traveller of the world. But some passing travellers are bright comets. Because of them, the planet becomes so wonderful and so energetic.