求翻译：很久以前，恐龙生活在地球上。地球上有上百种不同种类的恐龙，但他们不同时存在。很多恐龙都真的很大，有些重100000多公斤，有些长四十米左右。有些恐龙吃植物，有些吃肉。科学家们也不知道恐龙到最后为什么会消失。是什么意思？

A long time ago, the dinosaurs lived on Earth. There are hundreds of different kinds of dinosaurs on Earth, but they do not exist. Many dinosaurs are really great, some weighing more than 100 thousand kilograms, some 40 meters long. Some dinosaurs ate plants and some meat. Scientists do not know the

A very long time ago, dinosaurs living on this planet. On Earth, there are 100 different types of dinosaurs, but they do not exist simultaneously. Many dinosaurs are really big, some weighing more than 100,000 kilograms, about some 40 m long. Some dinosaurs, eat some meat-eating plants. Scientists a

Very before long time, dinosaur life on Earth.On the Earth has hundred kind of different type dinosaur, when they different exists.Very many dinosaur all really very big, somewhat heavy more than 100000 kilograms, about some length 40 meters.Some dinosaur eat the plant, somewhat eats the meat.The sc

A long time ago, dinosaurs lived on the Earth. There are hundreds of different kinds of dinosaurs on the Earth, but they do not exist. Many dinosaurs were really very big, some weighing more than 100,000 kilograms, some up to 40 meters. Some dinosaurs ate plants, eat some meat. Scientists don't know