一次,我偶然看了一部关于鲑鱼洄游的纪录片。我被深深地震撼了。鲑鱼生活在太平洋,成年后,它们会成群结队地来到阿拉斯加的河口,一路逆流而上,回到出生地繁衍后代。一路上,它们要历经无数的艰难险阻。当鲑鱼到达河口时,一个沙凼挡住了去路,鲑鱼在河口挤成一团,这时海中的天敌——食鱼鲨出现了。食鱼鲨的围剿令大批鲑鱼死于回乡路的起点。终于下雨了,河水上涨,漫过了沙凼,鲑鱼幸运地进入河道,摆脱了食 Once, I accidentally saw a documentary on the migration of salmon. I was deeply shocked. Salmon live in the Pacific Ocean. As adults, they come in droves to the Alaska estuary, all the way up the countercurrent and back to their birthplace to breed. Along the way, they have to go through countless difficulties and obstacles. When the salmon arrived at the mouth of the river, a sand-pak blocked the way and the salmon crooked at the mouth of the river. At this moment, the natural enemies in the sea, the fish-eating shark, appeared. Food fish shark siege to a large number of salmon died at the beginning of the return road. Finally it rains, the river goes up, diffusing over the Taipa, the salmon is lucky to enter the river and get rid of the food