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In autumn, Seattle is full of yellow leaves. As one of the three largest cities on the west coast of North America, Seattle attracts a large number of photography enthusiasts and tourists every season to watch natural wonders such as salmon migration in large and small rivers. When the time has reached September, a large number of salmon from across the Atlantic Ocean have gradually approached their birthplace. Along the way, they have experienced hunting by sharks and seals, and escaped the sharp teeth of brown bears and gray wolves. At the same time, they have worked hard to overcome the discomfort caused by fresh water. They have crossed dams and waterfalls step by step, and finally been able to swim upstream, and finally arrived at the place where their dreams began.