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A: Gravity is very important.

A: 重力很重要。

B: What is gravity?

B:什么是重力。

A: It's the force that pulls everything down.

A: 就是一种力，使物体落向地面的力。

B: I don't understand.

B:不懂。

A: If you pour water into a glass, the water goes down into the glass.

A: 如果你把水往杯子里倒，水会往下流，流进杯子里。

B: Of course it does.

B:当然了。

A: Without gravity, the water would go up.

A: 没有重力，水就会往上走。

B: You're joking.

B:你在逗我。

A: Without gravity, you would go up.

A: 没有重力，你也会飘起来。

B: What do you mean?

B:什么意思?

A: You would float into the sky like a balloon.

A: 你就会像气球一样飘在空中。

B: That would be fun!

B:那就太有意思了!