Cavemen often ate raw meat.
穴居人经常吃生肉。
They didn't cook their food.
他们不烹饪食物。
Now there are many things to help you cook.
现在有很多帮助你做饭的厨具。
In 2050, there will be house robots.
到2050年，将有室内机器人。
They will cook, clean and wash the dishes.
它们会做饭，打扫和洗碗。
Oh, cavemen didn't cook their meat?
哦，穴居人不煮肉？
It's OK. They didn't do the dishes either!
还好吧，他们也不用洗碗！
There were many trees, and there were many clean rivers.
过去有很多树，还有很多干净的河流。
Now, there are more and more buildings.
现在，有越来越多的高楼大厦。
We should help the earth now, so birds will have homes and the forests will be healthy and green again.
我们现在应该帮助地球，那么鸟儿将有家，森林将重新变得枝繁叶茂、生机勃勃。
Look! How beautiful the world was!
看！世界多么美丽啊！
Oh! What will the birds do?
哦！鸟儿怎么办？
Don't worry. People will help them.
不要担心，人类会帮助它们的。
Before humans lived on the earth, whales already lived in the sea.
在人类居住在地球上之前，鲸鱼已经居住在海里了。
Now, there are not many whales.
现在，鲸鱼不多了。
If we change now,
如果我们现在有所改变，
whales and humans will have a bright future.
鲸鱼和人类将有一个光明的未来。
Heal the world!
拯救世界！
Make it a better place!
使它成为一个更美好的地方！