English jokes that aliens can't understand.

Hello, Martians, welcome to the earth. I am honored to make a brief introduction to our planet.

This planet consists of ocean, land and outer space, from which human beings obtain resources and live.

There are thousands of creatures living in the ocean. Their lifestyles are somewhat different from those of humans. They can swim, but they can't walk like humans. Instead of breathing air, they get oxygen from water.

There are thousands of creatures on the land, such as animals, plants, etc. Humans are animals. Some animals can get energy from vegetables, fruits or meat like humans. Some only eat plants, while others only eat meat. Animals get oxygen from the air. Some walk on two legs, while others walk on four. Plants can't walk or breathe carbon dioxide. They produce oxygen and put it into the air.

Welcome to the earth, you can enjoy a free trip.