英语翻译We know that many animals do not stay in one place.Birds,fish and other animals move from one place to another at a certain time.They move for different reasons.When cold weather comes,many birds move to warmer places to find food.The salmon is born in fresh water but it travels many miles to salt water.There it spends its life.When it is old,it returns to its birthplace in fresh water.Then it gives birth and dies.In northern Europe,there is a kin

英语翻译
We know that many animals do not stay in one place.Birds,fish and other animals move from one place to another at a certain time.They move for different reasons.When cold weather comes,many birds move to warmer places to find food.The salmon is born in fresh water but it travels many miles to salt water.There it spends its life.When it is old,it returns to its birthplace in fresh water.Then it gives birth and dies.In northern Europe,there is a kind of mouse.They leave their mountain homes when they become too crowded.They move down to the low land.Sometimes they move all the way to the seaside,and many of them are killed when they fall into the sea.Recently (近来),scientists have studied the migration of a kind of lobster (龙虾).Every year,
when the season of the bad weather arrives,the lobsters get into a long line and start to walk
across the floor of the ocean.Nobody knows why they do this,and nobody knows where they go.So,sometimes we know why humans and animals move from one place to another,but at other
times we don’t.Maybe living things just like to travel