英语翻译Did you know that the whale is like a land animal?Whales

英语翻译
Did you know that the whale is like a land animal?Whales live in the sea,but they are not fish.They breathe as land animals do.They must hold their breath under water.
The whale is the largest animal on earth.In fact,it is the largest animal that has ever lived.Dinosaurs that lived long ago were not so large as the largest whales today.
How can any animal be so big?A land animal can have only as much weight as its legs will carry.A bird must be light so its wings can hold it in the air.But a whale does not have to stand on its own legs.The water holds it up.So a whale can be much bigger than a land animal.